[Red5] RTMP Ripper - High Security Hole with Red5, FMS, Wozwa?!
mikko.rantalainen at peda.net
Thu Jun 14 03:43:01 EDT 2007
> After some hours of testing we tryed to rip the "DRM Video" from
> Onlinelib ACP - Advanced or Anti Copy Protection
> (what a stupid name,hehe) and here the reply media catcher doenst works.
> There was no chance to save onlinelib DRM Demo from:
> It seems that here is more as a "marketing air bubble" behind ACP from
> Does anyone knows how they protect their Videos for ripping?!
Without inspecting the traffic in any way I guess they could be using a
technique similar to one used in encrypted DVB streams. If I've
understood correctly, encrypted DVB stream is mostly without encryption.
The only part that is encrypted is some pieces of every keyframe - just
enough to break decoding of the whole stream.
Perhaps flash player can download a partially corrupted (broken keyframe
data) FLV from the server, download encrypted patch for broken FLV file
from DRM-server, decrypt the patch and apply patch to the FLV on the fly
before decoding the video?
More information about the Red5