This specification defines the stream and initialization data formats for use with the Encrypted Media Extensions.

The Working Group maintains a list of all bug reports that the editors have not yet tried to address.

Implementors should be aware that this specification is not stable. Implementors who are not taking part in the discussions are likely to find the specification changing out from under them in incompatible ways. Vendors interested in implementing this specification before it eventually reaches the Candidate Recommendation stage should join the mailing list mentioned below and take part in the discussions.

Purpose

This registry is intended to enhance interoperability among implementations and users of encrypted media streams with the Encrypted Media Extensions (EME) specification. In particular, this registry provides the means (1) to identify and avoid collisions among initialization data type strings, and (2) to disclose information about encrypted data formats accepted by EME implementations to promote interoperability.

Organization

The registry maintains a mapping between initialization data type strings and encryption format specifications. The encryption format specifications describe the structure and semantics of initialization data.

This registry is not intended to include any information on whether a byte stream format is encumbered by intellectual property claims. Implementors and users are advised to seek appropriate legal counsel in this matter if they intend to implement or use a specific byte stream format.

Registration Entry Requirements

  1. Each entry must include a unique initialization data type string. If the byte stream format is derived-from an existing file format, then it should use the MIME-type/subtype pairs typically used for the file format.
  2. Each entry must include a link that references a publically available specification. It is recommended that such a specification be made available without cost (other than reasonable shipping and handling if not available by online means).
  3. Candidate entries must be announced on public-html-media@w3.org(subscribe, archives) so they can be discussed and evaluated for compliance before being added to the registry.

Registry

Initialization Data Type Public Specification(s)
cenc ISO Common Encryption EME Stream Format and Initialization Data
keyids Key IDs Initialization Data Format
webm WebM EME Stream Format and Initialization Data