Conditional entitlement processing for obtaining a control word
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United States of America Patent
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Jan 9, 2018
Grant Date -
May 7, 2015
app pub date -
Jan 12, 2015
filing date -
Mar 2, 2009
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Abstract
Embodiments of the invention provide an improved method and an improved receiver for obtaining a control word. Two or more subkeys are obtained in a receiver. Each subkey was encrypted under control of a key received in an entitlement message or transformed under control of a seed received in an entitlement message. After decryption or transformation, the subkeys are combined to obtain the control word. Typically at least one of the entitlement messages is a positive entitlement message and at least one of the entitlement messages is a negative entitlement message. Embodiments of the invention can be used in a conditional access system such as a Pay-TV system.
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