International organisation for standardisation organisation internationale de normalisation

Summary of discussions

4. Action Points

11. Common encryption format for ISO BMFF (23001-7)

    1. Topics

       1. ISO/IEC 23001-7 2^nd Edition

This format defines a way to encrypt media (audio, video, etc.) in files of the ISO base media file format family. By using a common encryption format, a single media asset can be used by several services and devices using different digital rights management systems, and the implementation complexity that would be consequent on having duplicate files and formats for the same content can be reduced or eliminated.

2. Contributions

Number	Session	Title	Source	Disposition
m31447	File Format	on common encryption	Jean Le Feuvre	Noted

3. Summary of discussions

   1. m31447 On Common Encryption

The problems with the ‘senc’ box were discussed at length in previous meetings, and we prefer not to re-open that too much. The major problem is that it’s a structure which ties into the sample tables (it has a sample count in it) so it would seem to belong in part 12, but it’s specific to a specific encryption format, so it should be in the specification that defines that format, which is a contradiction. There is also the minor problem that it’s not defined for unfragmented files (which could easily be remedied).

It could be added to Common Encryption as a common place where this information is stored, with a caveat about re/de-fragmentation (that it might be lost).

Joint experts to discuss with HbbTV experts. Perhaps an NB could ask for this in the DIS ballot of common encryption, which might issue without an FDIS ballot if there are no ‘no’ votes and this is not considered a major technical comment. We would like other bodies then to refer to this, not duplicate, or else we’d be making the situation worse, not better.

4. Action Points / Ballots

ISO/IEC DIS 23001-7 2^nd Edition (SC 29 N 13723)

Part 7: Common encryption format for ISO base media file format

DIS (2013-xx-xx)

12. Common encryption format for MPEG-2 TS (23001-9)

    1. Topics

       1. ISO/IEC 23001-9 Common encryption format for MPEG-2 TS

This format defines a way to encrypt media (audio, video, etc.) in files of the ISO base media file format family. By using a common encryption format, a single media asset can be used by several services and devices using different digital rights management systems, and the implementation complexity that would be consequent on having duplicate files and formats for the same content can be reduced or eliminated.

2. Contributions

Number	Session	Title	Source	Disposition
m31497	DASH	Summary of Voting on ISO/IEC DIS 23001-9	SC 29 Secretariat	Refer N13972

3.