Digital rights management (DRM) provides additional layers of security beyond a secure key exchange protocol offered by TLS. With DRM, the content keys are at no time directly exposed in the clear to any user. Instead the content keys are encrypted in the DRM licenses along with usage rules specifying which users or devices have access to the content keys.
A state-of-the-art DRM video system provides three elements of additional security: (1) the header data is a proxy for the key, which is then validated by (2) the Content Decryption Module and (3) the license server collectively. These additional layers of security effectively protect any type of streaming video.
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