Security classes in a media key block
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United States of America Patent
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Apr 16, 2013
Grant Date -
Feb 18, 2010
app pub date -
Aug 15, 2008
filing date -
Aug 15, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to one embodiment of the present invention, a method for broadcast encryption with security classes in a media key block is provided. In one embodiment the method includes receiving encrypted media of a first and a second class, where the media includes a common media key block, in a device of a first class and in a device of a second class. A first media key is calculated from the common media key block in the device of a first class. A first media key precursor is calculated from the common media key block in the device of a second class. The first media precursor may be used to decrypt media of a first class. The first media precursor may also be used to calculate a second media key in the device of a second class to decrypt content of a first class.
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