Certainly I lock my car in the car park - but I then take
key with me ;-)
With this sort of software 'protection' you are leaving
the key in the software - rather like leaving the key of
your car in the exhaust/tail pipe. It is security by
obscurity.
Apologies for the rant, but this is one of the areas that
I feel strongly about - it isn't possible to copy protect
digital media like this, be it DVD discs, audio, books or
programs (to name 4 media with high profile cracks).
If you supply the key with the media (or with the software
that decodes the media) you haven't added any security
only obscurity. To have real security you need to pass the
key seperately, eg on a dongle, smart card, my PGP key
exchange etc, and you need to individually encrypt each
item.