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ClearKey DRM

A minimalist, open‑standard Digital Rights Management system defined by W3C for encrypted media playback.


Overview

ClearKey DRM is a simple, royalty‑free DRM scheme specified in the W3C Encrypted Media Extensions (EME). It relies on clients retrieving unprotected keys via a JSON Web Key (JWK) set to decrypt encrypted media segments, offering a straightforward interoperability testbed without complex licensing.

Specification

Defined in the W3C EME Candidate Recommendation, ClearKey uses:

  • MediaKeySession: Browser API session to provide keys.
  • JSON Web Keys: A set of AES‑128 keys in JWK format delivered over HTTPS.
  • Segment Encryption: Common MPEG‑CENC formats (e.g., MP4 with Common Encryption) relying on ClearKey for decryption.

Use Cases

  • Testing and Prototyping: Developers validate EME implementations before integrating full‑featured DRM (Widevine, PlayReady).
  • Open‑Source Projects: Projects like Shaka Player support ClearKey to demonstrate EME capabilities without licensing.

Limitations

ClearKey lacks license policies, secure key rotation, and fraud prevention, making it unsuitable for commercial content protection. It serves primarily as a reference implementation.

See Also

  • Widevine
  • Forensic Watermarking

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