Information security – Prevention of unauthorized use of data including prevention... – Limitations on number or amount of copies
Reexamination Certificate
2006-06-13
2006-06-13
Vu, Kim (Department: 2135)
Information security
Prevention of unauthorized use of data including prevention...
Limitations on number or amount of copies
C713S193000, C713S194000, C720S718000
Reexamination Certificate
active
07062785
ABSTRACT:
A signal transmission method applicable to prevention of modification or alteration of the playback mode information, such as copying management information or charging information. The playback mode information form a terminal15P is data-converted for ciphering by a playback mode information appendage circuit14in a header appendage circuit13responsive to the key information from a terminal15K and the resulting information comprised of the data and the playback mode information is outputted. The reproducing side effects data conversion on the ciphered playback mode information for deciphering, by a playback mode information detection circuit26in a header separation circuit25, using the key information from a terminal27K, for taking out the original playback mode information at a terminal27P.
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Kawashima Isao
Kurihara Akira
Osawa Yoshitomo
Sako Yoichiro
Yoneyama Shigeyuki
Frommer William S.
Frommer & Lawrence & Haug LLP
Gyorfi Thomas
Presson Thomas F.
Sony Corporation
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