Cryptography – Video cryptography – Video electric signal modification
Reexamination Certificate
2007-08-28
2007-08-28
Barron, Jr., Gilberto (Department: 2132)
Cryptography
Video cryptography
Video electric signal modification
C713S171000, C713S185000, C713S189000, C713S193000, C726S026000, C705S057000
Reexamination Certificate
active
09973336
ABSTRACT:
A data delivery system has a capability of effectively and reliably protecting copyright of the data. A video source of a movie or the like is delivered in the form of encrypted data from a server apparatus to a playback apparatus. A decryption key used to decrypt the encrypted data is stored on a storage medium such as a memory card, and the storage medium is sent from the server apparatus to the playback apparatus in parallel with the delivery of the encrypted data. After completion of the playing of the movie by the playback apparatus in a movie theater, the storage medium is returned to the server apparatus. The server apparatus examines information stored on the storage medium to check whether the video source delivered in the form of data has been properly used in an authorized manner.
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Barron Jr. Gilberto
Frommer William S.
Lemma Samson
Presson Thomas F.
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