Clone this repo:


  1. 50431fd cdm: Rename kPersistentKeyRelease to kPersistentUsageRecord by Xiaohan Wang · 7 weeks ago master
  2. bd20cfc cdm: Rename kIntelConvergedSecurityAndManageabilityEngine to kIntel by Xiaohan Wang · 8 weeks ago
  3. d126025 cdm: Mark CDM_10 interface as stable by Xiaohan Wang · 4 months ago
  4. 163f878 cdm: Add CDM_11 interface by Xiaohan Wang · 4 months ago
  5. 57e2054 cdm: Misc cleanup in content_decryption_module.h by Xiaohan Wang · 4 months ago

Library CDM Interface

This directory contains files that define the shared library interface between an Encrypted Media Extensions (EME) Content Decryption Module (CDM) and Chromium or other user agents. It is used to build both user agents and CDMs.

This is also referred to as the “CDM interface” in the context of library CDM and in this doc.

TODO(xhwang): Add more sections describing the CDM interface.

Experimental and Stable CDM interface

A new CDM interface that‘s still under development is subject to change. This is called an “experimental CDM interface”. To avoid compatibility issues, a user agent should not support an experimental CDM interface by default (it’s okay to support it behind a flag). Similarly, a CDM vendor should not ship a CDM using an experimental CDM interface to end users.

The experimental status of a CDM interface ends when the development is complete and the CDM interface is marked as stable.

On newer CDM interfaces, a static boolean member kIsStable is present to indicate whether the CDM interface is stable or experimental.