Patents by Inventor Tatsuya Shimoii

Tatsuya Shimoii has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Content distribution system and distribution method, and content processing device and processing method
    Publication number: 20060212943
    Abstract: In a content delivery system including a server and content processing apparatus connected to each other across a network, a content delivered by the system is encrypted with a content key Kc, and supplied along with a sublicense encrypted with a work key Kw to a DTV. The sublicense includes a second use condition under which a content is used and a content key Kc for decrypting an encrypted content. The work key Kw for decrypting an encrypted content is included in a main license. The main license is supplied to the DTV separately from the content. The main license includes, in addition to the work key Kw, a first use condition under which a content under a subscription contract is used.
    Type: Application
    Filed: December 6, 2004
    Publication date: September 21, 2006
    Inventors: Naohisa Kitazato, Yoshiharu Dewa, Yasushi Katayama, Tatsuya Shimoii, Hideki Kagemoto, Katsumi Tokuda, Hiroki Murakami