A one-page reference for key delivery before you lock the architecture or sign a DRM contract: the EME license-acquisition flow (encrypted → generateRequest → message → POST with an entitlement token → update → key in the CDM), the 'who never sees the key' secret map (the clear content key only in KMS/HSM, the license server, and the CDM; default_KID is a public name; the communication key never in the client), the three dialects (Widevine license request; PlayReady challenge + KID; FairPlay SPC
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The handbook · 7 volumes
Fora Soft Video Engineering Handbook
This key delivery reference traces the EME license flow, maps who may see the content key and compares Widevine, PlayReady and FairPlay request dialects. We wrote seven volumes covering the whole video stack; start with Volume 3 for DRM and players, then Volume 2 for CMAF packaging, with Volume 1 for encoding. Written by Nikolay Sapunov, CEO at Fora Soft.
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