[FFmpeg-devel] Detecting encrypted DVDs

Andres Mejia mcitadel
Sat Jan 10 21:43:15 CET 2009

On Saturday 10 January 2009 08:41:08 am Reimar D?ffinger wrote:
> On Sat, Jan 10, 2009 at 01:26:03PM +0000, M?ns Rullg?rd wrote:
> > Encrypted DVDs give low-level read errors unless the drive has been
> > properly set up, e.g. by libdvdcss.  I don't know of anything unlocks
> > the drive without also decrypting the stream.
> Hm? I think at most RPC-2 drives do that, and in addition anyone who
> applied region-free firmware modifications should probably have a drive
> acting like RPC-1.
> > There are of course other sources of encrypted MPEG streams than DVDs.
> > The ISO spec does not assign any meaning to the scrambling control
> > field, and we've seen files that set it to a non-zero value even
> > though there is no encryption, so acting on this field is not
> > reliable.
> Well, if someone wants to do the effort, I think a one-time warning
> message that it might be encrypted would be acceptable.

I was thinking a one-time warning as well. It doesn't have to be just for 
DVDs, but for any DRM'ed stream.

> Greetings,
> Reimar D?ffinger
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