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I'm trying to encrypt arbitrary content using the PlayReady envelope format, in order to send it to a 3rd party app which supports that format.

I was not able to find the format specification online. Does anybody know where I can find the spec, or is it supported only by opaque services provided by Microsoft?

AssafD
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You will find the PlayReady Envelope format specified in the Microsoft PlayReady Documentation Pack (available to Microsoft PlayReady technology licensees). The relevant section is Specifications -> Microsoft PlayReady Format Specification -> 3. Envelope File Format.

Sander
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