DRM: ECCP with dashif:Laurl and single key

[dsilhavy]

A short description of the use case for the new test content.

This test content is supposed to demonstrate the Enhanced Clearkey Protection (ECCP) mechanism. In this case we are using a single key for both audio and video AdaptationSets.

Test content requirements

General description and requirements

• A single period MPD
• One video and one audio AdaptationSets.
• The content shall be encrypted with Clearkey and the cbcs encryption scheme.
• Both AdaptationSets use the same cenc:default_KID and consequently share the same key
• Both AdaptationSets define dashif:Laurl
• The server component linked in dashif:Laurl should return the valid key. As an example:
  • Request: {"kids":["nrQFDeRLSAKTLifXUIPiZg"],"type":"temporary"}
  • Response: {"keys":[{"kty":"oct","k":"FmY0xnWCPCNaSpRG-tUuTQ","kid":"nrQFDeRLSAKTLifXUIPiZg"}],"type":"temporary"}

DASH-IF documents and links

• DASH-IF Interoperability Points; Part 6: Content Protection
• Clear key license format: https://www.w3.org/TR/encrypted-media/#clear-key-license-format

[haudiobe]

Requirements;

• Requires an active server component. Axinom code may be used (if license ok) or Romain will create library independently.
• CMAF test vectors with cbcs
• MPD adding the above information.

[rbouqueau]

For the record only CC @dsilhavy :

WAVE vectors generated in July 2021 for CBCS Clearkey (didn't work in browsers at the time): https://www.gpac-licensing.com/downloads/CTA-Wave/t2-cbcs

    "key_id": "J5kmSWp_XSXaafKzsnmafw",
    "content_key": "ABEiM0RVZneImaq7zN3u_w"

(Refs: https://github.com/cta-wave/dpctf-tests/issues/12 and https://github.com/cta-wave/dpctf-tests/blob/master/test-config.json)