Under your technical question section for product support, it states this following:
Do Telltale's games have copy protection?
Yes, but we try to keep it as low-key and non-annoying as possible. Our downloadable games use a version of SecuROM that requires online activation. Our disc-based games also use SecuROM. Disc games don't require online activation, but the disc must be in the drive while you play.
My question is why does the Wallace and Gromit DVD require online activation instead of just allowing it to be played when the disc is in the drive?