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Update registry requirements
SHA: 084ca4f Reason: push, by chrisn Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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‎format-registry/stream/index.html‎

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<!DOCTYPE html><html lang="en" dir="ltr"><head>
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</style>
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<meta name="color-scheme" content="light">
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<meta name="revision" content="084ca4fd322ea6cef5e84fc2d430e09f75f21cb1">
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<meta name="description" content="This specification defines the stream formats for use with the Encrypted Media Extensions [ENCRYPTED-MEDIA].">
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<style>
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"xref": [
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"encrypted-media"
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],
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"publishISODate": "2024-07-22T00:00:00.000Z",
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"generatedSubtitle": "W3C Editor's Draft 22 July 2024"
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"gitRevision": "084ca4fd322ea6cef5e84fc2d430e09f75f21cb1",
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"publishISODate": "2025-12-03T00:00:00.000Z",
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"generatedSubtitle": "W3C Editor's Draft 03 December 2025"
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}</script>
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<link rel="stylesheet" href="https://www.w3.org/StyleSheets/TR/2021/W3C-ED"></head>
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<body class="h-entry informative" data-cite="encrypted-media"><div class="head">
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<p class="logos"><a class="logo" href="https://www.w3.org/"><img crossorigin="" alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72">
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</a></p>
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<h1 id="title" class="title">Encrypted Media Extensions Stream Format Registry</h1>
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<p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">W3C Editor's Draft</a> <time class="dt-published" datetime="2024-07-22">22 July 2024</time></p>
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<p id="w3c-state"><a href="https://www.w3.org/standards/types#ED">W3C Editor's Draft</a> <time class="dt-published" datetime="2025-12-03">03 December 2025</time></p>
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<details open="">
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<summary>More details about this document</summary>
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<dl>
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<p class="copyright">
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<a href="https://www.w3.org/policies/#copyright">Copyright</a>
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©
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2024
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2025
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<a href="https://www.w3.org/">World Wide Web Consortium</a>.
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<abbr title="World Wide Web Consortium">W3C</abbr><sup>®</sup>
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</div>
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<section id="abstract" class="introductory"><h2>Abstract</h2>
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<p>This specification defines the stream formats for use with the <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-1/">Encrypted Media Extensions</a></cite> [<cite><a class="bibref" data-link-type="biblio" href="#bib-encrypted-media" title="Encrypted Media Extensions">ENCRYPTED-MEDIA</a></cite>].</p>
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<p>This specification defines the stream formats for use with the <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-2/">Encrypted Media Extensions</a></cite> [<cite><a class="bibref" data-link-type="biblio" href="#bib-encrypted-media" title="Encrypted Media Extensions">ENCRYPTED-MEDIA</a></cite>].</p>
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<p>This registry is non-normative.</p>
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</section>
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<section id="sotd" class="introductory"><h2>Status of This Document</h2><p><em>This section describes the status of this
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document at the time of its publication. A list of current <abbr title="World Wide Web Consortium">W3C</abbr>
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publications and the latest revision of this technical report can be found
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in the <a href="https://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at
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https://www.w3.org/TR/.</em></p>
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in the
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<a href="https://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> standards and drafts index</a>.</em></p>
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<p>
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This document was published by the <a href="https://www.w3.org/groups/wg/media">Media Working Group</a> as
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an Editor's Draft.
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</p><p>Publication as an Editor's Draft does not
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imply endorsement by <abbr title="World Wide Web Consortium">W3C</abbr> and its Members. </p><p>
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This is a draft document and may be updated, replaced or obsoleted by other
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This is a draft document and may be updated, replaced, or obsoleted by other
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documents at any time. It is inappropriate to cite this document as other
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than work in progress.
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than a work in progress.
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</p><p>
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made in connection with the deliverables of
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the group; that page also includes
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instructions for disclosing a patent. An individual who has actual
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knowledge of a patent which the individual believes contains
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knowledge of a patent that the individual believes contains
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<a href="https://www.w3.org/policies/patent-policy/#def-essential">Essential Claim(s)</a>
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must disclose the information in accordance with
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<a href="https://www.w3.org/policies/patent-policy/#sec-Disclosure">section 6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
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</p><p>
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This document is governed by the
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<a id="w3c_process_revision" href="https://www.w3.org/policies/process/20231103/">03 November 2023 <abbr title="World Wide Web Consortium">W3C</abbr> Process Document</a>.
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<a id="w3c_process_revision" href="https://www.w3.org/policies/process/20250818/">18 August 2025 <abbr title="World Wide Web Consortium">W3C</abbr> Process Document</a>.
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</p></section><nav id="toc"><h2 class="introductory" id="table-of-contents">Table of Contents</h2><ol class="toc"><li class="tocline"><a class="tocxref" href="#abstract">Abstract</a></li><li class="tocline"><a class="tocxref" href="#sotd">Status of This Document</a></li><li class="tocline"><a class="tocxref" href="#purpose"><bdi class="secno">1. </bdi>Purpose</a></li><li class="tocline"><a class="tocxref" href="#organization"><bdi class="secno">2. </bdi>Organization</a></li><li class="tocline"><a class="tocxref" href="#entry-requirements"><bdi class="secno">3. </bdi>Registration Entry Requirements</a></li><li class="tocline"><a class="tocxref" href="#registry"><bdi class="secno">4. </bdi>Registry</a></li><li class="tocline"><a class="tocxref" href="#references"><bdi class="secno">A. </bdi>References</a><ol class="toc"><li class="tocline"><a class="tocxref" href="#informative-references"><bdi class="secno">A.1 </bdi>Informative references</a></li></ol></li></ol></nav>
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<section id="purpose"><div class="header-wrapper"><h2 id="x1-purpose"><bdi class="secno">1. </bdi>Purpose</h2><a class="self-link" href="#purpose" aria-label="Permalink for Section 1."></a></div>
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<p>This registry is intended to enhance interoperability among implementations and users of encrypted media streams with the
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<cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-1/">Encrypted Media Extensions</a></cite> (EME) specification [<cite><a class="bibref" data-link-type="biblio" href="#bib-encrypted-media" title="Encrypted Media Extensions">ENCRYPTED-MEDIA</a></cite>]. In particular, this registry provides the means (1) to identify
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<cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-2/">Encrypted Media Extensions</a></cite> (EME) specification [<cite><a class="bibref" data-link-type="biblio" href="#bib-encrypted-media" title="Encrypted Media Extensions">ENCRYPTED-MEDIA</a></cite>]. In particular, this registry provides the means (1) to identify
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and avoid collisions among content type strings, and (2) to disclose information about encrypted data formats accepted by EME
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implementations to promote interoperability.
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</p></section>
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<section id="organization"><div class="header-wrapper"><h2 id="x2-organization"><bdi class="secno">2. </bdi>Organization</h2><a class="self-link" href="#organization" aria-label="Permalink for Section 2."></a></div>
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<p>The registry maintains a mapping between content type strings and encryption format specifications, which describe the structure, semantics, and processing of the formats.
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The strings are those used for the media type/subtype pairs in <code>contentType</code> values provided to <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-1/">Encrypted Media Extensions</a></cite> [<cite><a class="bibref" data-link-type="biblio" href="#bib-encrypted-media" title="Encrypted Media Extensions">ENCRYPTED-MEDIA</a></cite>] APIs.
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The strings are those used for the media type/subtype pairs in <code>contentType</code> values provided to <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-2/">Encrypted Media Extensions</a></cite> [<cite><a class="bibref" data-link-type="biblio" href="#bib-encrypted-media" title="Encrypted Media Extensions">ENCRYPTED-MEDIA</a></cite>] APIs.
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</p>
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<p>This registry is not intended to include any information on whether a stream format is encumbered by intellectual property claims. Implementors and users
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are advised to seek appropriate legal counsel in this matter if they intend to implement or use a specific stream format.</p>
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<ol>
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<li>
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<p>Each entry must include a unique MIME-type/subtype pair. 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.</p>
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Each entry must include a unique MIME-type/subtype pair. 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.
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</li>
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<li>
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<p>Each entry must include a link that references a publicly available specification.
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It is recommended that such a specification be made available without cost (other than reasonable shipping and handling if not available by online means).
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</p>
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Each entry must include a link that references a publicly available specification.
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It is recommended that such a specification be made available without cost (other than reasonable shipping and handling if not available by online means).
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</li>
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<p>Candidate entries must be announced by filing an issue in the
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Per the <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-2/">Encrypted Media Extensions</a></cite> specification, the media container for a stream format must not be encrypted.</li>
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<li>
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Per the <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-2/">Encrypted Media Extensions</a></cite> specification, entries must be fully specified and support "common encryption" such that the content can decrypted in a fully specified and compatible way when a key or keys are provided.
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</li><li>
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Candidate entries must be announced by filing an issue in the
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so they can be discussed and evaluated for compliance before being added to
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the registry.
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</li>
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<li>
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If the Media Working Group reaches consensus to accept the candidate,
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a pull request should be drafted
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(either by the registry editors or by the party requesting the candidate registration)
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to register the candidate.
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The registry editors will review and merge the pull request.
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</li>
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<li>
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Existing entries cannot be deleted or deprecated.
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<li><p>Per the <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-1/">Encrypted Media Extensions</a></cite> specification, the media container for a stream format must not be encrypted.</p></li>
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<li><p>Per the <cite><a data-matched-text="[[[ENCRYPTED-MEDIA]]]" href="https://www.w3.org/TR/encrypted-media-1/">Encrypted Media Extensions</a></cite> specification, entries must be fully specified and support "common encryption" such that the content can decrypted in a fully specified and compatible way when a key or keys are provided.</p></li>
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<li><p>Existing entries cannot be deleted or deprecated.</p></li>
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</section>
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</dd><dt id="bib-eme-stream-webm">[EME-STREAM-WEBM]</dt><dd>
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<a href="https://www.w3.org/TR/eme-stream-webm/"><cite>WebM Stream Format</cite></a>. Joey Parrish; Greg Freedman. W3C. 18 July 2024. W3C Working Group Note. URL: <a href="https://www.w3.org/TR/eme-stream-webm/">https://www.w3.org/TR/eme-stream-webm/</a>
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</dd><dt id="bib-encrypted-media">[ENCRYPTED-MEDIA]</dt><dd>
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<a href="https://www.w3.org/TR/encrypted-media-1/"><cite>Encrypted Media Extensions</cite></a>. David Dorwin; Jerry Smith; Mark Watson; Adrian Bateman. W3C. 18 September 2017. W3C Recommendation. URL: <a href="https://www.w3.org/TR/encrypted-media-1/">https://www.w3.org/TR/encrypted-media-1/</a>
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<a href="https://www.w3.org/TR/encrypted-media-2/"><cite>Encrypted Media Extensions</cite></a>. Joey Parrish; Greg Freedman. W3C. 21 August 2025. W3C Working Draft. URL: <a href="https://www.w3.org/TR/encrypted-media-2/">https://www.w3.org/TR/encrypted-media-2/</a>
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</dd></dl>
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</section></section><p role="navigation" id="back-to-top">
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<a href="#title"><abbr title="Back to Top">↑</abbr></a>
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