Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2002-02-21
2010-02-16
Truong, Thanhnga B (Department: 2438)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C455S003040, C455S090100, C455S410000, C455S500000, C348S086000, C348S086000, C725S054000, C380S259000, C367S117000
Reexamination Certificate
active
07664951
ABSTRACT:
A transmitting apparatus adapted to effectively use the band for transferring programs of television broadcasting. A program of a first channel transmitted from the transmitting side can be viewed in real time on the receiving side. A program of a second channel is transmitted to the receiving side in advance in a time zone of lower audience rate than other time zones and stored in a storage device of the receiving side. Each program to be stored is encrypted. When a provision time of a program comes, the data such as a key are transmitted from the transmitting side to the receiving side along with the program data of the first channel. The receiving side extracts the data such as a key and, by use of the extracted data, provides the program stored in the storage device to viewers.
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Frommer William S.
Frommer & Lawrence & Haug LLP
Presson Thomas F.
Sony Corporation
Truong Thanhnga B
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