| 5943422 |
Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels |
| Aug-24-1999 |
Electronic steganographic techniques can be used to encode a rights management control signal onto an information signal carried over an insecure communications channel. Steganographic techniques ensure... |
| 5933498 |
System for controlling access and distribution of digital property |
| Aug-3-1999 |
A method and device are provided for controlling access to data. Portions of the data are protected and rules concerning access rights to the data are determined. Access to the protected portions of the... |
| 5923754 |
Copy protection for recorded media |
| Jul-13-1999 |
A method and apparatus for securely transferring an encrypted-data key and a medium key, from a media storage such as a DVD disk to an output device in a computer system, using a randomly generated first... |
| 5892899 |
Tamper resistant methods and apparatus |
| Apr-6-1999 |
In accordance with a first aspect of the present invention, a security sensitive program that operates with a secret is made tamper resistant by distributing the secret in space as well as in time. In... |
| 5864620 |
Method and system for controlling distribution of software in a multitiered distribution chain |
| Jan-26-1999 |
A system and method and system for controlling distribution of software to an user in a multitiered distribution chain. The system includes at least one entity that distributes the software in a locked... |
| 5857021 |
Security system for protecting information stored in portable storage media |
| Jan-5-1999 |
A security system for protecting information stored in portable storage media by checking identifiers assigned to each medium, system, and terminal. Medium IDs are identifiers written by manufacturers... |
| 5848158 |
Data copyright management system |
| Dec-8-1998 |
A data copyright management system is provided, in which a primary user edits a received data and supplies the edited data to a secondary user. The copyright management system comprises a database and... |
| 5825877 |
Support for portable trusted software |
| Oct-20-1998 |
A form of authentication is provided wherein a trusted third party signs a certificate to identify the author of a program and to secure its integrity. The program code is encapsulated or otherwise associated... |
| 5818933 |
Copyright control system |
| Oct-6-1998 |
A copyright control system for performing access control to copyright digital information. The copyright control system is equipped with an encryption/decryption hardware 11 which accepts encrypted copyright... |
| 5796829 |
Conditional access system |
| Aug-18-1998 |
An access control processor for a conditional access system in which encrypted information segments provided by a plurality of information service providers are encrypted for transmission in accordance... |
| 5751805 |
Data-protecting system |
| May-12-1998 |
A data-protection system which permits authorized users to use a target data through a simple operation but does not permit unauthorized users to use the program even though they may be able to copy it.... |
| 5737413 |
Information distribution system wherein storage medium storing ciphered information is distributed |
| Apr-7-1998 |
A system for use when distributing information stored in a piece of storage medium from a supplier to users through a distributor(s). The information is ciphered when stored in each piece of storage medium... |
| 5729609 |
Method for producing a common key in two devices, in order to implement a common cryptographic procedure, and associated apparatus |
| Mar-17-1998 |
The invention relates to a method and an apparatus for producing a key that is common to two devices that belong to different sets and are intended to implement a common cryptographic procedure. Each device... |
| 5715448 |
Open database system wherein access by subscribers to a network is limited |
| Feb-3-1998 |
Data of textiles for various types of items offered by a different textile company stored in an integrated database (DR) of a data service company item by item, and data of business results relating to... |
| 5715403 |
System for controlling the distribution and use of digital works having attached usage rights where the usage rights are defined by a usage rights grammar |
| Feb-3-1998 |
A system for controlling use and distribution of digital works. The present invention allows the owner of a digital work to attach usage rights to their work. The usage rights define how the individual... |
| 5673316 |
Creation and distribution of cryptographic envelope |
| Sep-30-1997 |
A method and apparatus to create, distribute, sell and control access to digital documents using secure cryptographic envelopes. An envelope is an aggregation of information parts, where each of the parts... |
| 5646999 |
Data coypright management method |
| Jul-8-1997 |
The present invention provides a process for managing data copyright in the case when a primary user produces new data by editing a plurality of original data and supplies the new data to a secondary user.... |
| 5638443 |
System for controlling the distribution and use of composite digital works |
| Jun-10-1997 |
A system for controlling use and distribution of composite digital works. A digital work is comprised of a description part and a content part. The description part contains control information for the... |
| 5636277 |
System for licensing to use software products |
| Jun-3-1997 |
A system for licensing to use software products which are encrypted and packed in a single storage medium, whereby the encrypted software products can be sold on a piece-by-piece basis and it is possible... |
| 5636276 |
Device for the distribution of music information in digital form |
| Jun-3-1997 |
In order to distribute music information from a central memory device (2) via a communications network (4) to a terminal (6), this information is organized in a digital music information object. The latter... |
| 5629980 |
System for controlling the distribution and use of digital works |
| May-13-1997 |
A system for controlling use and distribution of digital works. In the present invention, the owner of a digital work attaches usage rights to that work. Usage rights are granted by the "owner" of a digital... |
| 5509070 |
Method for encouraging purchase of executable and non-executable software |
| Apr-16-1996 |
A method and apparatus of encouraging distribution, registration, and purchase of free copyable software and other digital information which is accessed on a User's System via a Programmer's Program. Software... |
| 5499298 |
Controlled dissemination of digital information |
| Mar-12-1996 |
The present invention is a method and apparatus for controlling the dissemination of digital information. Digital information is structured logically to incorporate usage history and allowable access window... |
| 5319705 |
Method and system for multimedia access control enablement |
| Jun-7-1994 |
A method and system are disclosed for securely distributing a plurality of software files from a software distribution processor to a user processor, while selectively enabling the user processor to only... |
| 5109413 |
Manipulating rights-to-execute in connection with a software copy protection mechanism |
| Apr-28-1992 |
A software asset protection mechanism segregates the right to execute software from the software itself. The rights to execute, when installed on a composite computing system, are stored in a coprocessor... |
| 4888798 |
Modular software security |
| Dec-19-1989 |
Disclosed is a computer method and apparatus that permits identical copies of encrypted computer software (including a number of software elements) to be distributed to many users while retaining central... |
