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Using DRM with multiple keys
Encrypting with different keys per track based on CPIX documents
This demonstrates how a CPIX document can be used to set 3 different keys for audio, SD video and HD video tracks, along with DRM specific data for both PlayReady and Widevine.
The benefits of this solution:
Satisfy the DRM requirements of content owners
Enforce hardware DRM for premium features to offer highest possible protection
Use standard level of DRM protection for regular content to offer broad compatibility with end-user devices
Ensure maximum flexibility with separate encryption keys for audio, SD, HD, 4K etc.
Recommended by Google Widevine and Microsoft PlayReady