Description 
I've done a minor bit of digital forensics work and I know that keys, signatures, and checksums are big in that world.  Perhaps we could have a running instance of Motion generate a private key in which it can create a signature for each of the movies (or images) it produces, then you could verify the signature of the movies.  It would be in-memory only, no two instances would use the same key..  There are examples of such a thing on the net.  One that comes to mind is dcfldd, which is a digital signature implemented dd for forensics use.
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PeterS - 21 Oct 2005
  Follow up 
I think this will add a significant load to Motion.
If someone really needs to sign movies and pictures it should be done with an on_xxxx script.
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KennethLavrsen - 18 Dec 2005