Method and apparatus for providing hierarchical key system in restricted-access television system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 30, 2000
Grant Date -
N/A
app pub date -
Mar 7, 1997
filing date -
Mar 7, 1997
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An encryption system for restricted-access television systems. Decryption keys, which are used to decrypt program material, are transmitted to customers in a restricted-access television system. The keys are transmitted as a hierarchy, wherein one key unlocks another key, and the last key unlocked is used to decrypt program material. Such a hierarchy is sometimes called 'key-upon-key' encryption. The system transmits a second key that produces a first key from a cipher text (which first key decrypts a first program material) and wherein the second key also decrypts a second program material.
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