How do I strip WMDRM from hundreds of files at once?

[tominator]

Hi

I work for a small movie video on demand-service. We use WMV-files with WMDRM to restrict the rental time.

We are now in the process of making some changes to the service that will require us to reencrypt all of our movies. The movies have to be unencrypted in order to encrypt them again.

Because of old excecutive decisions we didnt have any backup of our unencrypted movie files at the beginning (we have been running for a long time) and because of a harddrive crashing we now don't have our older movies unencrypted.

Of course we could reencode them all, but I was hoping that perhaps there is a way to strip them of the encryption.

We have access to both the private and public key of the encryption used so I see it as it must be doable, but how would I go about doing it? And how would I do it in a large batch all at once?

Any help would be very appreciated.

[Reimar]

We have access to both the private and public key of the encryption used so I see it as it must be doable, but how would I go about doing it?


I guess FreeMe2 can do it. If you have the actual encryption key (different for each file), FFmpeg, MPlayer and mencoder can use that, too.
I think FreeMe2 will print that key (calling it SID).
Obviously, the "Decrypting" forum would have made more sense for this question, that's also where the thread on FreeMe2 is.


And how would I do it in a large batch all at once?


Using a batch file? Well, something more advanced like a Linux shell (under Windows from MinGW/Cygwin) or even a real programming language might work better.
Obviously make a proper backup before doing anything...

[tominator]

Obviously make a proper backup before doing anything...

Thanks for your reply :) Didnt get the backup thing at first but yes of course.