Limitations on number or amount of copies

CL 726 SC 31

7039848	Data recording medium, data recording method and apparatus, data playback method and apparatus, and data determination method
May-2-2006	A recording medium includes an area in which data encoded with an error correction code is recorded. In the recording medium, data which contains an error uncorrectable with the error correction code,...
7039613	System and method for controlling distribution and use of digital works using price specifications
May-2-2006	A method, system and device for determining fees for access to digital works including associating a usage right with a digital work and which specifies a manner of use of the digital work and (i) a fee...
6976166	Method and apparatus for partial encryption of content
Dec-13-2005	The present invention is directed to methods and apparatus that partially encrypt an information data file. An exemplary method includes dividing the information file into a first file and a second file,...