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Mpeg flags for DRM support at newer encoding API - was: RFC: V4L2 MPEG Encoding API: Part 2

On Tuesday 02 May 2006 22:34, Mauro Carvalho Chehab wrote:
> Em Seg, 2006-05-01 às 00:40 +0200, Hans Verkuil escreveu:
> > Audio controls
> > ==============
> >
> > V4L2_CID_COMP_AUDIO_COPYRIGHT
> > Set whether the material has copyright or not.
> > BOOL: possible values: 1 = has copyright, 0 = does not have
> > copyright
> >
> > V4L2_CID_COMP_AUDIO_ORIGINAL
> > Set if the material is original or a copy.
> > BOOL: possible values: 1 = original, 0 = copy
> >
> >
> > Stream controls
> > ===============
> >
> > The first copyright control maps to a stream property in the
> > ISO/IEC 11172-1 standard. The second is device specific and lists
> > the various stream types that the device can produce.
> >
> > V4L2_CID_COMP_STREAM_COPYRIGHT
> > BOOL
> > 0=Stream is not copyrighted
> > 1=Stream is copyrighted
>
> Although we are not discussing DRM implementation at kernel, those
> flags are meant to help on DRM controls. I'm not sure if we should or
> not implement it.

For the record, these flags have NOTHING to do with DRM. They cannot be 
used to implement DRM. They just mark the stream as having copyright 
and are the MPEG equivalent of saying 'Copyright by...'. There is no 
encryption involved, nor can it be used for that. All MPEG programs 
like xine, mplayer, etc. and also all commercial programs for whatever 
platform will and must accept MPEG streams with this bit. There is 
simply NO DRM INVOLVED. I still don't know how you get this idea into 
your head :-(

Regards,

          Hans

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