MPEG Common Encryption: Difference between revisions

Revision as of 22:30, 18 June 2016

Revision as of 18:26, 29 July 2016

Line 1:

'''MPEG Common Encryption''' (abbreviated '''MPEG-CENC''') refers to a set of two [[Moving Picture Experts Group|MPEG]] standards governing different [[Digital container format|container formats]]:

* for [[MPEG-4 Part 14ISO_base_media_file_format|MP4ISOBMFF]], ''Common encryption in ISO base media file format files'' (ISO/IEC 23001-7:2016)[http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=68042]

* for [[MPEG transport stream|MPEG-TS]], ''Common encryption of MPEG-2 transport streams'' (ISO/IEC 23001-9:20142016)[http://www.iso.org/iso/home/store/catalogue_tccatalogue_ics/catalogue_detailcatalogue_detail_ics.htm?csnumber=6344070175]

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.

== Copyright ==

The standards can be purchased from iso.org, on paper and in digital forms. As of July 2016, the prices were 118 [[Swiss franc]] (122 USD) for the ISOBMFF version, and 58 Swiss franc (60 USD) for the TS version. An included copyright notice prohibits redistribution without written permission, also on [[local area network]]s. Each page is watermarked with the purchaser's name and company.

== External links ==

* [https://w3c.github.io/encrypted-media/format-registry/initdata/cenc.html "cenc" Initialization Data Format] – a rough description, specific to ISOBMFF, of the ''Clear Key'' encryption scheme, intended for use in [[Encrypted Media Extensions]]

== See also ==

* [[MPEG-Dash]]

* [[Encrypted Media Extensions]]

* [[Media Source Extensions]]

{{computing-stub}}