> That isn't correct. In a crypto system, the "secret key" must be in possession of the one who will open the lock. The difference here is that, in a DRM system, you give the lock and the key to the person you don't want to open it. Now, in closed source software this can (arguably) work, since you can't see what the software is doing. So, the user presses play, the software puts a blind in front of the user saying "please wait"

Uhh, no. It decrypts the content and loads it up, where software without DRM doesn't have to perform the decryption step. No part of that is necessarily visible, so no "blind" is needed.