DRM (digital rights management) is the enforcement of restrictions on access control to data through technical means, such as copy protection.

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Does HDCP impose HD-playback restrictions for sinks?

In order to be HDCP compliant, a source can only output HDCP-encrypted digital HD content. However, is the opposite true for HDCP sinks? In order to be HDCP compliant, should a sink only accept to ...
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How would an improved “read receipt” work as an email, Facebook post, or webpage?

I'm exploring various ways to implement cryptographic read receipts, that would be used to tell the content producer that the content was viewed. In addition to feedback reporting, a response might ...