On Tuesdays the USPTO issues new patents. Both of today's Spotlight patents address copyright protection and rights management techniques. Assigned to Sony, the first of today's issued patents addresses systems for authoring content data and techniques for protecting the content. Assigned to Ricoh, the second patent addresses techniques for encrypting and reproducing digital data while protecting copyright.
7,328,458, "Authoring system, authoring key generator, authoring device, authoring method, and data supply device, information terminal and information distribution method," assigned to Sony (JP).
An authoring system authors content data for distribution through an information terminal by encryption for copyright protection. The system includes an authoring device and an authoring key generator. The generator generates a content identifier uniquely allocated to each of the content data, an authoring key enabling key uniquely allocated to the authoring device, and an authoring key obtained by encrypting a content key for encrypting the content data and a second content key using the CID and the CEK. The second content key is formed by encrypting the content key using a root key. The authoring device has a unit which decrypts the content key and the second content key using the CID and the CEK, and a unit which encrypts the content data using the decrypted content key to generate authored encrypted content data.
7,330,980, "Method of and system for encrypting digital data, method of and apparatus for reproducing digital data, and computer product," assigned to Ricoh (JP)
There is provided an input unit which reads copyright digital data stored in a recording medium such as a CD-ROM, an operation unit which performs encryption of digital data based on an encryption algorithm from a plurality of encryption algorithms. A file unit outputs the digital data encrypted by the operation unit and an index value and the encryption operation equation generation parameter into one file. A reproducing apparatus obtains an encryption operation equation from the index value and the encryption operation equation generation parameter in this same file and reproduces the encrypted digital