Apparatus for managing members of at least one group of decoders having access to broadcast data
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United States of America Patent
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Dec 29, 2020
Grant Date -
Dec 14, 2017
app pub date -
Jul 6, 2017
filing date -
Feb 4, 2010
priority date (Note) -
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Abstract
A technique to manage members of a group of decoders having access to broadcast data, each group member sharing a common broadcast encryption scheme (BES) comprising the steps of, in a stage for a decoder to become a group member, receiving keys pertaining to the position in the group according to the BES, receiving a current group access data comprising a current group access key, and in a stage of accessing broadcast data, using the current group access data to access the broadcast data, and in a stage of renewing the current group access key, sending a first group message comprising at lease a next group access key encrypted so that only non-revoked decoders can access it, said group message being further encrypted by the current group access key, updating the current group access key with the next group access key.
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