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<title>MPEG Common Encryption</title>
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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">MPEG Common Encryption</span></span>
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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p><b>MPEG Common Encryption</b> (abbreviated <b>MPEG-CENC</b>) refers to a set of two <a href="Moving_Picture_Experts_Group" title="Moving Picture Experts Group">MPEG</a> standards governing different <a href="Digital_container_format" class="mw-redirect" title="Digital container format">container formats</a>:
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<ul><li>for <a href="ISO_base_media_file_format" title="ISO base media file format">ISOBMFF</a>, <i>Common encryption in ISO base media file format files</i> (ISO/IEC 23001-7:2016)<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li>
<li>for <a href="MPEG_transport_stream" title="MPEG transport stream">MPEG-TS</a>, <i>Common encryption of MPEG-2 transport streams</i> (ISO/IEC 23001-9:2016)<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li></ul>
<p>The specifications are compatible, so that conversion between the encrypted formats can happen without re-encryption.
They define metadata, specific to each format, about which parts of the stream are encrypted and by which encryption scheme. Each encryption scheme may have different methods to retrieve the decryption key.
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<div class="mw-heading mw-heading2"><h2 id="Availability_of_the_Standards">Availability of the Standards</h2></div>
<p>The standards can be purchased from iso.org, on paper and in digital forms. As of July 2016, the prices were 118 <a href="Swiss_franc" title="Swiss franc">Swiss franc</a> (US$122) for the ISOBMFF version, and 58 Swiss franc (US$60) for the TS version. An included copyright notice prohibits redistribution without written permission, also on <a href="Local_area_network" title="Local area network">local area networks</a>. Each page is watermarked with the purchaser's name and company.
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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.iso.org/standard/68042.html">"Iso/Iec 23001-7:2016"</a>.</cite></span>
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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.iso.org/standard/70175.html">"Iso/Iec 23001-9:2016"</a>.</cite></span>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://w3c.github.io/encrypted-media/format-registry/initdata/cenc.html">"cenc" Initialization Data Format</a> – a rough description, specific to ISOBMFF, of the <i>Clear Key</i> encryption scheme, intended for use in <a href="Encrypted_Media_Extensions" title="Encrypted Media Extensions">Encrypted Media Extensions</a></li></ul>
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This article is issued from <a class="external text" title="Last edited on 2021-10-17" href="https://en.wikipedia.org/wiki/?title=MPEG_Common_Encryption&oldid=1050438386">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.
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