Contents sale system6889208Abstract In a contents sale system, original contents data are encrypted into encryption-resultant contents data in response to original playback key data. The original playback key data are encrypted into first encryption-resultant playback key data. The first encryption-resultant playback key data are encrypted into second encryption-resultant playback key data in response to an ID of a sale destination terminal apparatus. The encryption-resultant contents data and the second encryption-resultant playback key data are transmitted to the sale destination terminal apparatus. The sale destination terminal apparatus is enabled to decrypt the second encryption-resultant playback key data into the first encryption-resultant playback key data in response to the ID of the sale destination terminal apparatus. The sale destination terminal apparatus is enabled to decrypt the first encryption-resultant playback key data into the original playback key data. The sale destination terminal apparatus is enabled to decrypt the encryption-resultant contents data into the original contents data in response to the original playback key data. Claims 1. In a contents sale system including a host apparatus, a sale source terminal apparatus, a sale destination terminal apparatus, and copy destination apparatus, a method comprising the steps of: Description BACKGROUND OF THE INVENTION As shown in FIG. 3, the transfer control data contain four bits b0, b1, b2, and b3 occupied by a data piece representing a transfer generation number (a copy generation number), and four bits b4, b5, b6, and b7 occupied by a data piece representing whether transfer (copying) is prohibited or permitted. Specifically, the transfer-generation-number data piece (the copy-generation-number data) b0, b1, b2, and b3 being "0000" is assigned to prohibition on transfer (copying). The transfer-generation-number data piece b0, b1, b2, and b3 being anyone between "0001" and "1111" is assigned to an indication of a transfer generation number (a copy generation number) and also permission to transfer (copy) contents data. The related copyright holder or the host side sets an initial number represented by the transfer-generation-number data piece. Each time transferring or copying contents data is executed, the transfer-source player or apparatus (the copy-source player or apparatus) processes the transferred data or the copied data so that the number represented by the transfer-generation-number data piece is decremented by "1". When the transfer-generation-number data piece reaches "0000", transferring or copying contents data is prohibited. For example, the transfer-source player or apparatus (the copy-source player or apparatus) is disabled by the transfer-generation-number data piece being "0000". The transfer prohibition/permission data piece (the copying prohibition/permission data piece) b4, b5, b6, and b7 being "0000" is assigned to permission to transfer (copy) contents data. The transfer prohibition/permission data piece b4, b5, b6, and b7 being "0001" is assigned to prohibition on transfer (copying). FIGS. 4, 5, and 6 show a sequence of communications between the kiosk terminal apparatus 5 and the customer's player 6a. In FIGS. 4, 5, and 6, "Form 1", "Form 2", . . . denote forms of transmitted signals respectively. With reference to FIG. 4, in the case where the customer's player 6a is connected with the kiosk terminal apparatus 5 via the IEEE1394 interface, the kiosk terminal apparatus 5 transmits player authentication "A" data of a form "1" to the customer's player 6a. In response to the player authentication "A" data, the customer's player 6a transmits reply player authentication "A" data and host authentication "A" data of a form "2" to the kiosk terminal apparatus 5. Then, the kiosk terminal apparatus 5 transmits reply host authentication "A" data of a form "3" to the customer's player 6a. In response to the reply host authentication "A" data, the customer's player 6a transmits a form-"4" signal of the result of host authentication "A" to the kiosk terminal apparatus 5. Subsequently, the kiosk terminal apparatus 5 transmits a form-"5" signal of a player ID transmission request to the customer's player 6a. In response to the signal of the player ID transmission request, the customer's player 6a transmits a form-"6" signal of its own player ID to the kiosk terminal apparatus 5. Then, the kiosk terminal apparatus 5 transmits a form-"7" signal of a transfer history transmission request (a copy history transmission request) to the customer's player 6a. In response to the signal of the transfer history transmission request, the customer's player 6a transmits a form-"8" signal of a transfer history (a copy history) to the kiosk terminal apparatus 5. Subsequently, the kiosk terminal apparatus 5 transmits a form-"9" signal of a transfer history deletion request (a copy history deletion request) to the customer's player 6a. In response to the signal of the transfer history deletion request, the customer's player 6a transmits a form-"10" signal of a transfer history deletion notice (a copy history deletion notice) to the kiosk terminal apparatus 5. Then, the communication sequence advances to either a contents transfer stage or an edited data transfer stage in accordance with operation of the kiosk terminal apparatus 5. With reference to FIG. 5, during the contents transfer stage, the kiosk terminal apparatus 5 transmits a form-"11" signal of a ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the kiosk terminal apparatus 5. Then, the kiosk terminal apparatus 5 transmits a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the kiosk terminal apparatus 5. Subsequently, the kiosk terminal apparatus 5 transmits a form-"17" signal of a stored contents sale ID transmission request to the customer's player 6a. In response to the signal of the stored contents sale ID transmission request, the customer's player 6a transmits a form-"18" signal of a stored contents sale ID to the kiosk terminal apparatus 5. Then, the kiosk terminal apparatus 5 transmits a sale header of a form "19" to the customer's player 6a. The customer's player 6a transmits a form-"22" signal of a data reception notice to the kiosk terminal apparatus 5 when successfully receiving the sale header. Thereafter, the kiosk terminal apparatus 5 transmits a sale sub header of a form "20" to the customer's player 6a. The customer's player 6a transmits a form-"22" signal of a data reception notice to the kiosk terminal apparatus 5 when successfully receiving the sale sub header. Then, the kiosk terminal apparatus 5 transmits contents data (encryption-resultant contents data) of a form "21" to the customer's player 6a. The customer's player 6a transmits a form-"22" signal of a data reception notice to the kiosk terminal apparatus 5 when successfully receiving the contents data. Subsequently, the kiosk terminal apparatus 5 transmits playback key data (secondary encryption-resultant playback key data) of a form "25" to the customer's player 6a. The customer's player 6a transmits a form-"26" signal of a data reception notice when successfully receiving the playback key data. Thereafter, the customer's player 6a is disconnected from the kiosk terminal apparatus 5. In other words, the IEEE1394 interface between the kiosk terminal apparatus 5 and the customer's player 6a is disconnected. With reference to FIG. 6, during the edited data transfer stage, the kiosk terminal apparatus 5 transmits a form-"30" signal of a request for transmission of edited data (data to be edited) to the customer's player 6a. In response to the signal of the edited data transmission request, the customer's player 6a transmits edited data (data to be edited) of a form "31" to the kiosk terminal apparatus 5. Then, the kiosk terminal apparatus 5 transmits contents deletion data of a form "32" to the customer's player 6a. In response to the contents deletion data, the customer's player 6a transmits a form-"33" signal of a contents deletion notice to the kiosk terminal apparatus 5. Subsequently, the kiosk terminal apparatus 5 transmits a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the kiosk terminal apparatus 5. Then, the kiosk terminal apparatus 5 transmits editing-resultant data of a form "34" to the customer's player 6a. The customer's player 6a transmits a form-"35" signal of a data reception notice to the kiosk terminal apparatus 5 when successfully receiving the editing-resultant data. Thereafter, the customer's player 6a is disconnected from the kiosk terminal apparatus 5. In other words, the IEEE1394 interface between the kiosk terminal apparatus 5 and the customer's player 6a is disconnected. As previously mentioned, the authoring system unit 1 includes a computer which operates in accordance with a control program stored in a memory. FIG. 7 is a flowchart of a segment of the control program. As shown in FIG. 7, a first step S1 of the program segment generates 16-byte playback key data in response to a random number for every sale header. A step S2 following the step S1 divides sale contents data into regions of a contents header, a sound stream, text data, and extension data respectively. The sound stream represents music contents. The text data represent tune names and artist names. The step S2 executes Exclusive-OR operation between each of the regions and the playback key data 16-byte by 16-byte. Thus, the step S2 encrypts or scrambles the sale contents data independently for the regions. In this way, the step S2 generates encryption-resultant contents data. A step S3 subsequent to the step S2 generates 16-byte data of a hash value on the basis of a sequence of characters in each sale header in the designation item order and a sequence of characters in each sale sub header in the designation item order according to a hash function (MD5). A step S4 following the step S3 executes Exclusive-OR operation between the playback key data and the hash value data, thereby encrypting the playback key data into primary encryption-resultant playback key data for every sale header. A step S5 subsequent to the step S4 places the primary encryption-resultant playback key data in an appointed area of every sale header. The step S5 transmits the encryption-resultant contents data and the primary encryption-resultant playback key data toward the kiosk terminal apparatus 5 via the equipments including the transmission server 2. After the step S5, the current execution cycle of the program segment ends. In this way, the playback key data are encrypted by the steps S3 and S4. The encryption of the playback key data prohibits the decoding of the contents data if the combination of the sale header (the sale headers) and the contents data is altered. As previously mentioned, the terminal apparatus 5 includes a computer which operates in accordance with a control program stored in a memory. FIG. 8 is a flowchart of a segment of the control program. As shown in FIG. 8, a first step S11 of the program segment further encrypts the primary encryption-resultant playback key data into secondary encryption-resultant playback key data in response to a transfer-destination player ID (a copy-destination player ID, that is, the ID of the customer's player 6a) according to DES. Here, DES is short for "data encryption standards". A step S12 following the step S11 transmits the encryption-resultant contents data and the secondary encryption-resultant playback key data to the customer's player 6a. After the step S12, the current execution cycle of the program segment ends. As previously mentioned, the customer's player 6a includes a computer which operates in accordance with a control program stored in a memory. FIG. 9 is a flowchart of a segment of the control program. The program segment in FIG. 9 relates to descrambling encryption-resultant contents data. As shown in FIG. 9, a first step S21 of the program segment decrypts the secondary encryption-resultant playback key data into the primary encryption-resultant playback key data in response to the ID of the customer's player 6a according to DES for every sale header. A step S22 following the step S21 generates 16-byte data of a hash value on the basis of a sequence of characters in each sale header in the designation item order and a sequence of characters in each sale sub header in the designation item order according to a hash function (MD5). A step S23 subsequent to the step S22 executes Exclusive-OR operation between the primary encryption-resultant playback key data and the hash value data, thereby decrypting the primary encryption-resultant playback key data into the original playback key data for every sale header. A step S24 following the step S23 executes Exclusive-OR operation between the encryption-resultant contents data and the original playback key data 16-byte by 16-byte, thereby decrypting or descrambling the encryption-resultant contents data into the compressed contents data. The step S24 expands the compressed contents data into the original contents data (the uncompressed contents data). The playback of the original contents data can be implemented in response to a customer's request. After the step S24, the current execution cycle of the program segment ends. FIG. 10 is a flowchart of another segment of the control program for the computer in the customer's player 6a. The program segment in FIG. 10 relates to transferring or copying data from the customer's player 6a to the customer's player 6b. As shown in FIG. 10, a first step S31 of the program segment refers to transfer control data in every sale header. The step S31 decides whether the transfer control data represents prohibition or permission concerning data transfer (copying). When the transfer control data represents prohibition, the program exits from the step S31 and then the current execution cycle of the program segment ends. On the other hand, when the transfer control data represents permission, the program advances from the step S31 to a step S32. The step S32 decrements a transfer generation number (a copy generation number) represented by the transfer control data. The decrement corresponds to a number reduction of "1". A step S33 following the step S32 decrypts the secondary encryption-resultant playback key data (transmitted from the kiosk terminal apparatus 5) into the primary encryption-resultant playback key data in response to the ID of the customer's player 6a according to DES for every sale header. A step S34 subsequent to the step S33 encrypts the primary encryption-resultant playback key data into other secondary encryption-resultant playback key data or third encryption-resultant playback key data in response to the ID of the copy-destination player (the transfer-destination player) 6b. A step S35 following the step S34 transmits the encryption-resultant contents data and the secondary encryption-resultant playback key data (generated by the step S34) to the copy-destination player 6b. The customer's player 6b recovers the original contents data as the customer's player 6a does (see FIG. 9). After the step S35, the current execution cycle of the program segment ends. The customer's player 6a is designed to upload the transfer control data representative of the transfer generation number (the copy generation number) to a host side each time the transfer generation number is updated. It should be noted that to update contents data (encryption-resultant contents data) stored in the kiosk terminal apparatus 5, the apparatus 5 may be periodically replaced with a new one. Application software for the kiosk terminal apparatus 5 can be transmitted thereto from the uplink center 3 via the satellite 4. Second Embodiment FIG. 11 shows a contents sale system according to a second embodiment of this invention. The contents sale system in FIG. 1 is similar to the contents sale system in FIG. 1 except for design changes mentioned hereinafter. It should be noted that the contents sale system in FIG. 1 and the contents sale system in FIG. 11 may be combined into a versatile contents sale system. The contents sale system in FIG. 11 includes a web server 9 and a PC client 10 for Internet service. The web server 9 includes a computer which operates in accordance with a control program stored in a memory. The control program is designed to enable the web server 9 to implement processes mentioned later. The PC client 10 includes a computer which operates in accordance with a control program stored in a memory. The control program is designed to enable the PC client 10 to implement processes mentioned later. The web server 9 is connected to a transmission server 2 and an account management server 8. The web server 9 may also be connected to a management center MC (see FIG. 1). The PC client 10 can be connected to the web server 9 via the Internet. A customer's player 6a can be connected with the PC client 10 via an IEEE1394 interface. Composite data of a given format which include encryption-resultant contents data and primary encryption-resultant playback key data (first encryption-resultant playback key data) are transmitted from an authoring system unit 1 to the web server 9 via the transmission server 2. In the case where the customer's player 6a is connected with the PC client 10 via the IEEE1394 interface while the PC client 10 is connected with the web server 9 via the Internet, the player 6a informs the web server 9 of its own ID via the connection between them. The web server 9 encrypts the primary encryption-resultant playback key data into secondary encryption-resultant playback key data (second encryption-resultant playback key data) in response to the ID of the player 6a. The web server 9 downloads the encryption-resultant contents data and the secondary encryption-resultant playback key data to the player 6a via the PC client 10. In the case where the customer's player 6a is connected with the PC client 10 via the IEEE1394 interface while the PC client 10 is connected with the web server 9 via the Internet, the player 6a transmits accounting information, which relates to a balance in the player 6a, to the account management server 8 via the connection between them. FIGS. 12, 13, 14, 15, 16, and 17 show a sequence of communications among the web server 9, the PC client 10, and the customer's player 6a. In FIGS. 12-17, "Form 38", "Form 39", . . . denote forms of transmitted signals respectively. With reference to FIG. 12, in the case where the customer's player 6a is connected with the PC client 10 via the IEEE1394 interface, the PC client 10 transmits player authentication "B" data of a form "38" to the customer's player 6a. In response to the player authentication "B" data, the customer's player 6a transmits reply player authentication "B" data and host authentication "B" data of a form "39" to the PC client 10. Then, the PC client 10 transmits reply host authentication "B" data of a form "40" to the customer's player 6a. In response to the reply host authentication "B" data, the customer's player 6a transmits a form-"41" signal of the result of host authentication "B" to the PC client 10. Subsequently, the PC client 10 transmits a form-"11" signal of a ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the PC client 10. Then, the PC client 10 transmits a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the PC client 10. Thereafter, the PC client 10 transmits a form-"17" signal of a stored contents sale ID transmission request to the customer's player 6a. In response to the signal of the stored contents sale ID transmission request, the customer's player 6a transmits a form-"18" signal of a stored contents sale ID to the PC client 10. Then, the PC client 10 transmits a form-"30" signal of a request for transmission of edited data (data to be edited) to the customer's player 6a. In response to the signal of the edited data transmission request, the customer's player 6a transmits edited data (data to be edited) of a form "31" to the PC client 10. Subsequently, the communication sequence advances to one of a contents selection and purchase stage, a ticket purchase stage, and a contents editing and deleting stage in accordance with a user's request which is inputted by operating the PC client 10. With reference to FIG. 13, during the contents selection and purchase stage, the PC client 10 transmits a form-"11" signal of a ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the PC client 10. Then, the PC client 10 transmits a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the PC client 10. Subsequently, the PC client 10 transmits a form-"17" signal of a stored contents sale ID transmission request to the customer's player 6a. In response to the signal of the stored contents sale ID transmission request, the customer's player 6a transmits a form-"18" signal of a stored contents sale ID to the PC client 10. Then, the PC client 10 transmits contents purchase request information to the web server 9. Next, the web server 9 transmits a signal of a sale contents check result to the PC client 10. Thereafter, the PC client 10 transmits a signal of a contents purchase request to the web server 9. The web server 9 transmits player authentication "A" data of a form "1" to the PC client 10, and the PC client 10 transmits the player authentication "A" data to the customer's player 6a. In response to the player authentication "A" data, the customer's player 6a transmits reply player authentication "A" data and host authentication "A" data of a form "2" to the PC client 10. Then, the PC client 10 transmits the reply player authentication "A" data and the host authentication "A" data to the web server 9. Next, the web server 9 transmits reply host authentication "A" data of a form "3" to the PC client 10, and the PC client 10 transmits the reply host authentication "A" data to the customer's player 6a. In response to the reply host authentication "A" data, the customer's player 6a transmits a form-"4" signal of the result of host authentication "A" to the PC client 10. Then, the PC client 10 transmits the signal of the host authentication "A" result to the web server 9. Subsequently, as shown in FIG. 14, the web server 9 transmits a form-"5" signal of a player ID transmission request, a form-"11" signal of a ticket balance transmission request, a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request), a form-"17" signal of a stored contents sale ID transmission request, and a form-"7" signal of a transfer history transmission request (a copy history transmission request) to the PC client 10. Then, the PC client 10 transmits the signal of the player ID transmission request to the customer's player 6a. In response to the signal of the player ID transmission request, the customer's player 6a transmits a form-"6" signal of its own player ID to the PC client 10. Then, the PC client 10 transmits the signal of the ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the PC client 10. Next, the PC client 10 transmits the signal of the usable-memory-capacity transmission request (the unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the PC client 10. Subsequently, the PC client 10 transmits the signal of the stored contents sale ID transmission request to the customer's player 6a. In response to the signal of the stored contents sale ID transmission request, the customer's player 6a transmits a form "18" signal of a stored contents sale ID to the PC client 10. Next, the PC client 10 transmits the signal of the transfer history transmission request (the copy history transmission request) to the customer's player 6a. In response to the signal of the transfer history transmission request, the customer's player 6a transmits a form-"8" signal of a transfer history (a copy history) to the PC client 10. Thereafter, the PC client 10 transmits the signal of the player ID, the signal of the ticket balance, the signal of the usable memory capacity, the signal of the stored contents sale ID, and the signal of the transfer history to the web server 9. Subsequently, the web server 9 transmits a form-"9" signal of a transfer history deletion request (a copy history deletion request) to the PC client 10, and the PC client 10 transmits the signal of the transfer history deletion request to the customer's player 6a. In response to the signal of the transfer history deletion request, the customer's player 6a transmits a form-"10" signal of a transfer history deletion notice (a copy history deletion notice) to the PC client 10. Then, the PC client 10 transmits the signal of the transfer history deletion notice to the web server 9. Next, as shown in FIG. 15, the web server 9 transmits a sale header of a form "19", a sale sub header of a form "20", and contents data (encryption-resultant contents data) of a form "21" to the PC client 10. Subsequently, the PC client 10 transmits the sale header to the customer's player 6a. The customer's player 6a transmits a form-"22" signal of a data reception notice to the PC client 10 when successfully receiving the sale header. Then, the PC client 10 transmits the sale sub header to the customer's player 6a. The customer's player 6a transmits a form-"22" signal of a data reception notice to the PC client 10 when successfully receiving the sale sub header. Next, the PC client 10 transmits the contents data (the encryption-resultant contents data) to the customer's player 6a. The customer's player 6a transmits a form-"22" signal of a data reception notice to the PC client 10 when successfully receiving the contents data. The PC client 10 transmits the signals of the data reception notices, which have been received from the customer's player 6a, to the web server 9. Subsequently, the web server 9 transmits playback key data (secondary encryption-resultant playback key data) of a form "25" to the PC client 10, and the PC client 10 transmits the playback key data to the customer's player 6a. The customer's player 6a transmits a form-"26" signal of a data reception notice to the PC client 10 when successfully receiving the playback key data. The PC client 10 transmits the signal of the data reception notice to the web server 9. Thereafter, the customer's player 6a is disconnected from the PC client 10. In other words, the IEEE1394 interface between the PC client 10 and the customer's player 6a is disconnected. With reference to FIG. 16, during the ticket purchase stage, the PC client 10 transmits a form-"11" signal of a ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the PC client 10. Then, the PC client 10 transmits ticket purchase request information to the web server 9. Next, the web server 9 transmits a signal of a sale contents check result to the PC client 10. Subsequently, the PC client 10 transmits a signal of a ticket purchase request to the web server 9. Thereafter, the web server 9 transmits player authentication "A" data of the form "1" to the PC client 10, and the PC client 10 transmits the player authentication "A" data to the customer's player 6a. In response to the player authentication "A" data, the customer's player 6a transmits reply player authentication "A" data and host authentication "A" data of the form "2" to the PC client 10. Then, the PC client 10 transmits the reply player authentication "A" data and the host authentication "A" data to the web server 9. Next, the web server 9 transmits reply host authentication "A" data of the form "3" to the PC client 10, and the PC client 10 transmits the reply host authentication "A" data to the customer's player 6a. In response to the reply host authentication "A" data, the customer's player 6a transmits a form-"4" signal of the result of host authentication "A" to the PC client 10. Then, the PC client 10 transmits the signal of the host authentication "A" result to the web server 9. Next, the web server 9 transmits a form-"5" signal of a player ID transmission request, a form-"11" signal of a ticket balance transmission request, and a form-"7" signal of a transfer history transmission request (a copy history transmission request) to the PC client 10. Then, the PC client 10 transmits the signal of the player ID transmission request to the customer's player 6a. In response to the signal of the player ID transmission request, the customer's player 6a transmits a form-"6" signal of its own player ID to the PC client 10. Then, the PC client 10 transmits the signal of the ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the PC client 10. Next, the PC client 10 transmits the signal of the transfer history transmission request (the copy history transmission request) to the customer's player 6a. In response to the signal of the transfer history transmission request, the customer's player 6a transmits a form-"8" signal of a transfer history (a copy history) to the PC client 10. Thereafter, the PC client 10 transmits the signal of the player ID, the signal of the ticket balance, and the signal of the transfer history to the web server 9. Subsequently, the web server 9 transmits a form-"9" signal of a transfer history deletion request (a copy history deletion request) to the PC client 10, and the PC client 10 transmits the signal of the transfer history deletion request to the customer's player 6a. In response to the signal of the transfer history deletion request, the customer's player 6a transmits a form-"10" signal of a transfer history deletion notice (a copy history deletion notice) to the PC client 10. Then, the PC client 10 transmits the signal of the transfer history deletion notice to the web server 9. Next, an electronic ticket issuing process of a form "37" is implemented. Thereafter, the customer's player 6a is disconnected from the PC client 10. In other words, the IEEE1394 interface between the PC client 10 and the customer's player 6a is disconnected. The contents editing and deleting stage is implemented while the customer's player 6a remains connected with the PC client 10 but the PC client 10 continues to be out of connection with the web server 9. With reference to FIG. 17, during the contents editing and deleting stage, the PC client 10 transmits contents deletion data of a form "32" to the customer's player 6a. In response to the contents deletion data, the customer's player 6a transmits a form-"33" signal of a contents deletion notice to the PC client 10. Subsequently, the PC client 10 transmits a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the PC client 10. Then, the PC client 10 transmits editing-resultant data of a form "34" to the customer's player 6a. The customer's player 6a transmits a form-"35" signal of a data reception notice to the PC client 10 when successfully receiving the editing-resultant data. Thereafter, the customer's player 6a is disconnected from the PC client 10. In other words, the IEEE1394 interface between the PC client 10 and the customer's player 6a is disconnected. Third Embodiment A third embodiment of this invention is similar to one of the first embodiment (see FIGS. 1-10) and the second embodiment (see FIGS. 11-17) thereof, or a combination of the first and second embodiments thereof except for design changes mentioned hereinafter. In the third embodiment of this invention, the forms of signals transmitted between a kiosk terminal apparatus 5 and a customer's player 6a, and the forms of signals transmitted among a web server 9, a PC client 10, and a customer's player 6a are of first and second types corresponding to first and second basic formats respectively. FIG. 18 shows the first basic format of transmitted signals. As shown in FIG. 18, a signal of the first basic format has a sequence of a code word (an ID code word) representing a transmission source, a code word representing a command, and an information piece representing the length of data (encryption-resultant data). The data-length information piece is followed by the data (the encryption-resultant data). The ID code word is added to the transmitted signal by the transmission source. The first basic format is used for data-added transmitted signals. FIG. 19 shows the second basic format of transmitted signals. As shown in FIG. 19, a signal of the second basic format has a sequence of a code word (an ID code word) representing a transmission source, a code word representing a command, and an information piece representing a data length of "0". The ID code word is added to the transmitted signal by the transmission source. The second basic format is used for data-less transmitted signals such as transmitted signals representing requests or notices. FIG. 20 shows a list of code words (ID code words) representing transmission sources. As shown in FIG. 20, a code word "A00h" is assigned to a customer's player 6a. A code word "A01h" is assigned to a kiosk terminal apparatus 5. A code word "A02h" is assigned to a settlement box 7. A code word "A03h" is assigned to an Internet contents management portion. A code word "A04h" is assigned to an Internet settlement management portion. A code word "A05h" is assigned to a ticket server. A code word "A06h" is assigned to a kiosk working management server. A code word "A07h" is assigned to an account management server 8. A code word "A08h" is assigned to an Internet PC client 10. A code word "A09h" is assigned to a transmission server 2. A code word "A0Ah" is assigned to an authoring system unit 1. Code words "A0Bh", "A0Ch", "A0Dh", "A0Eh", and "A0Fh" are reserved. FIG. 21 shows a first list of code words representing commands (or transmitted-signal types) including requests, notices, and others. As shown in FIG. 21, a code word "B00h" is assigned to player authentication "A" data transmission A code word "B01h" is assigned to reply host authentication "A" data transmission. A code word "B02h" is assigned to a player ID transmission request. A code word "B03h" is assigned to a transfer history transmission request. A code word "B04h" is assigned to a transfer history deletion request. A code word "B05h" is assigned to a ticket balance transmission request. A code word "B06h" is assigned to a ticket issue end notice. Code words "B07h" and "B08h" are reserved. A code word "B09h" is assigned to a usable-memory-capacity transmission request. A code word "B0Ah" is assigned to a stored contents sale ID transmission request. A code word "B0Bh" is assigned to sale header transmission. A code word "B0Ch" is assigned to sale sub header transmission. A code word "B0Dh" is assigned to sale contents data transmission. A code words "B0Eh" is reserved. A code word "B0Fh" is assigned to playback key data transmission. A code word "B10h" is assigned to reply player authentication "A" data and host authentication "A" data transmission. A code word "B11h" is assigned to host authentication "A" result transmission. A code word "B12h" is assigned to player ID transmission. A code word "B13h" is assigned to transfer history transmission. A code word "B14h" is assigned to a transfer history deletion notice. A code word "B15h" is assigned to ticket balance transmission. A code word "B16h" is assigned to a ticket issue reception notice. Code words "B17h" and "B18h" are reserved. A code word "B19h" is assigned to usable-memory-capacity transmission. A code word "B1Ah" is assigned to stored contents sale ID transmission. FIG. 22 shows a second list of code words representing commands (or transmitted-signal types) including requests, notices, and others. As shown in FIG. 22, code words "B1Bh" and "B1Ch" are reserved. A code word "B1Dh" is assigned to a playback key data reception notice. A code word "B1Eh" is assigned to player authentication "B" data transmission. A code word "B1Fh" is assigned to reply host authentication "B" data transmission. A code word "B20h" is assigned to an edited data transmission request. A code word "B21h" is assigned to contents deletion data transmission. A code word "B22h" is assigned to editing-resultant data transmission. Code words "B23h", "B24h", "B25h", "B26h", and "B27h" are reserved. A code word "B28h" is assigned to edited data transmission. A code word "B29h" is assigned to a sale contents data deletion notice. A code word "B2Ah" is assigned to an editing-resultant data reception notice. Code words "B2Bh", "B2Ch", and "B2Dh" are reserved. A code word "B2Eh" is assigned to reply player authentication "B" data and host authentication "B" data transmission. A code word "B2Fh" is assigned to host authentication "B" result transmission. Code words "B30h" to "BDFh" are reserved. A code word "BE0H" is reserved. A code word "BE1h" is assigned to a data reception notice. A code word "BE2h" is assigned to a command reception notice. A code word "BE3h" is assigned to a command retransmission request. A code word "BE4h" is assigned to stand-by command transmission. Code words "BE5h", "BE6h", "BE7h", "BE8h", and "BE9h" are reserved. A code word "BEAh" is assigned to electronic ticket transmission. Code words "BEBh", "BECh", "BEDh", and "BEEh" are reserved. A code word "BEFh" is assigned to discontinuing command transmission. FIG. 23 is a flowchart of a segment of a control program for a computer in the customer's player 6a. The program segment in FIG. 23 relates to slave reply transmission from the customer's player according to a communication system in which a contents transmission source (the kiosk terminal apparatus 5 or the PC client 10) acts as a master while the customer's player 6a operates as a slave. The control program segment in FIG. 23 is designed so that the customer's player 6a transmits data or a command to the contents transmission source only when receiving a related transmission request therefrom. In other words, the customer's player 6a is inhibited from spontaneously transmitting data or a command to the contents transmission source. As shown in FIG. 23, a first step S41 of the program segment decides whether or not a signal of a transmission request has come from a contents transmission source. When a transmission request signal has not come, the program exits from the step S41 and then the current execution cycle of the program segment ends. On the other hand, when a transmission request signal has come, the program advances from the step S41 to a step S42. The step S42 implements a process of preparing and providing a transmission object (data or a command) designated by the transmission request signal. The step S42 selects a signal form in accordance with the transmission object. The step S42 formats the transmission object into the selected form. A step S43 following the step S42 transmits the transmission object of the selected form to the contents transmission source as a reply to the transmission request signal. After the step S43, the current execution cycle of the program segment ends. Fourth Embodiment A fourth embodiment of this invention is similar to one of the second embodiment (see FIGS. 11-17) and the third embodiment (see FIGS. 18-23) thereof except for design changes mentioned hereinafter. FIGS. 24 and 25 show a portion of a sequence of communications among a web server 9, a PC client 10, and a customer's player 6a according to the third embodiment of this invention. In FIGS. 24 and 25, "Form 38", "Form 39", . . . denote predetermined forms (formats) of transmitted signals respectively. With reference to FIG. 24, in the case where the customer's player 6a is connected with the PC client 10 via an IEEE1394 interface, the PC client 10 transmits player authentication "B" data of a form "38" to the customer's player 6a. In response to the player authentication "B" data, the customer's player 6a transmits reply player authentication "B" data and host authentication "B" data of a form "39" to the PC client 10. Then, the PC client 10 transmits reply host authentication "B" data of a form "40" to the customer's player 6a. In response to the reply host authentication "B" data, the customer's player 6a transmits a form-"41" signal of the result of host authentication "B" to the PC client 10. Subsequently, the PC client 10 transmits a form-"11" signal of a ticket balance transmission request to the customer's player 6a. In response to the signal of the ticket balance transmission request, the customer's player 6a transmits a form-"12" signal of a ticket balance to the PC client 10. Then, the PC client 10 transmits a form-"15" signal of a usable-memory-capacity transmission request (an unoccupied-memory-capacity transmission request) to the customer's player 6a. In response to the signal of the usable-memory-capacity transmission request, the customer's player 6a transmits a form-"16" signal of a usable memory capacity (an unoccupied memory capacity) to the PC client 10. Thereafter, the PC client 10 transmits a form-"17" signal of a stored contents sale ID transmission request to the customer's player 6a. In response to the signal of the stored contents sale ID transmission request, the customer's player 6a transmits a form-"18" signal of a stored contents sale ID to the PC client 10. Then, the communication sequence advances to one of a contents selection and purchase stage, a ticket purchase stage, and a contents editing and deleting stage in accordance with a user's request which is inputted by operating the PC client 10. With reference to FIG. 25, during the contents selection and purchase stage, the PC client 10 transmits contents purchase request information to the web server 9. Next, the web server 9 transmits a signal of a sale contents check result to the PC client 10. Thereafter, the PC client 10 transmits a signal of a contents purchase request to the web server 9. The web server 9 transmits player authentication "A" data of a form "1" to the PC client 10, and the PC client 10 transmits the player authentication "A" data to the customer's player 6a. In response to the player authentication "A" data, the customer's player 6a transmits reply player authentication "A" data and host authentication "A" data of a form "2" to the PC client 10. Then, the PC client 10 transmits the reply player authentication "A" data and the host authentication "A" data to the web server 9. Next, the web server 9 transmits reply host authentication "A" data of a form "3" to the PC client 10, and the PC client 10 transmits the reply host authentication "A" data to the customer's player 6a. In response to the reply host authentication "A" data, the customer's player 6a transmits a form-"4" signal of the result of host authentication "A" to the PC client 10. Then, the PC client 10 transmits the signal of the host authentication "A" result to the web server 9. Fifth Embodiment A fifth embodiment of this invention is similar to one of the first embodiment (see FIGS. 1-10), the second embodiment (see FIGS. 11-17), the third embodiment (see FIGS. 18-23), and the fourth embodiment (see FIGS. 24 and 25) thereof except for design changes mentioned hereinafter. FIG. 26 shows the structure of a sale header provided and added by an authoring system unit 1 (see FIGS. 1 and 11) during a mastering process. Besides items in the sale header of FIG. 2, the sale header 26 contains an information piece of a manufactured article title, information pieces of the names of N tunes, information pieces of the names of artists of the N tunes, and information pieces of ISRC (International Standard Recording Code) of the N tunes. With reference to FIG. 27, bytes of a sale sub header are sequentially assigned to indications of different items as follows. Text data is of a given format mentioned hereinafter. As shown in FIG. 28, text data of the given format is divided into segments (1-text-corresponding segments) corresponding to texts "1", "2", "3", . . . , and "N" respectively. Here, "N" denotes a predetermined natural number. Every 1-text-corresponding segment is composed of N successive text frames each having 16 bytes. Each text frame has a sequence of 3 bytes representing a time stamp, 1 byte representing a frame number, and 12 bytes representing a portion of actual text data. Exclusive-OR operation between text data and playback key data 16-byte by 16-byte (frame-by-frame) encrypts the text data. Exclusive-OR operation between encryption-resultant text data and playback key data 16-byte by 16-byte decrypts the encryption-resultant text data. Sixth Embodiment FIG. 29 shows a contents sale system according to a sixth embodiment of this invention. The contents sale system in FIG. 29 is similar to the contents sale system in FIG. 11 except for design changes mentioned hereinafter. It should be noted that the contents sale system in FIG. 1 and the contents sale system in FIG. 29 may be combined into a versatile contents sale system. The contents sale system in FIG. 29 includes an i-mode mobile telephone relay station 10A instead of the PC client 10 (see FIG. 11). Here, "i-mode" means a contents-information transmission service provided by a mobile telecommunication company to users of mobile telecommunication terminals via the Internet. The relay station 10A is provided with an i-mode account manager i-AM. The account manager i-AM executes account management similar to that carried out by an account management server 8. The contents sale system in FIG. 29 also includes a management center MC connected between a transmission server 2 and a web server 9. In the contents sale system of FIG. 29, a customer's player 6a includes a mobile telephone terminal which can operate in an i-mode. The customer's player 6a can be connected with the relay station 10A on an i-mode basis. In the case where the customer's player 6a is connected with the relay station 10A on the i-mode basis, the customer's player 6a can transmit a signal of an order for desired contents to the management center MC via the relay station 10A and the web server 9. As a reply to the order, the customer's player 6a can receive desired contents data via the web server 9 and the relay station 10A. Communications among the web server 9, the relay station 10A, and the customer's player 6a are basically similar to those among the web server 9, the PC client 10, and the customer's player 6a (see FIGS. 12, 13, 14, 15, 16, and 17). Before communications are started, the customer's player 6a is connected with the relay station 10A on the i-mode basis. During communications, the customer's player 6a remains connected with the relay station 10A on the i-mode basis. After communications have been completed, the i-mode coupling between the customer's player 6a and the relay station 10A is disconnected.
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