Title:
DIGITAL VIDEO CONTENT COPYRIGHT MANAGEMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2007/000805
Kind Code:
A1
Abstract:
A digital video content copyright management method stores user information on
a user, an encrypted medium file obtained by encrypting a medium file of a digital video
content by a common key A, and reproduction permission file containing view limit
information on a video work and the common key A in a media server. The media server
transmits an encrypted medium file of the video work requested from a user terminal
of a user and encryption-permitted in which a reproduction-permitted file is
encrypted by a common key B generated from the user information corresponding to
the user terminal, to the user terminal. The user terminal decrypts the encryption-permitted file
by the common key B generated according to its user information into a reproduction-permitted file
and acquires the common key A. The user terminal processes a medium file obtained by
decrypting the encrypted medium file by using the key A and reproduces a video work
in such a way that it can be viewed.
Inventors:
SUZUKI KATSUHISA (JP)
Application Number:
PCT/JP2005/011782
Publication Date:
January 04, 2007
Filing Date:
June 28, 2005
Export Citation:
Assignee:
TANIMIZU HIROHIKO (JP)
SUZUKI KATSUHISA (JP)
SUZUKI KATSUHISA (JP)
International Classes:
G06F12/14; G06F15/00; H04L9/08
Foreign References:
| JP2000293439A | 2000-10-20 | |||
| JP2001175604A | 2001-06-29 |
Attorney, Agent or Firm:
ISSHIKI & CO. (12-7 Shinbashi 2-chom, Minato-ku Tokyo 04, JP)
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