This is very easy to do, of course. The encryption they use is a stripped-
down and made worthless version of SSL that is vulnerable to MiM attacks and
such. Plus the "signature" is created by taking a hash of the file size... It
is all documented online.
So breaking the DRM is easy, but it would automatically be hit with a DMCA
violation for breaking digital copyright protection schemes, or whatever is
the equivalent in Canada or the EU or whatever. (DMCA is really just a
legislation passed to enforce a international treaty if you look at it
Thankyou, USA Government and friends for keeping the world safe for piracy,
but illegal for making compatible software.