| http://www.w3.org/ns/prov#value | - In an embodiment of the present invention, as an alternative to a trailer 504 including a certificate, a digital signature or other information, the trailer is encrypted in a cryptographic envelope defined by the Public Key Cryptography Standard #7 format for cryptographic envelopes. [0060]FIG. 6 is a block diagram showing a more detailed view of the metadata 508 in a content file, in an embodimen
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