Well no, it's not quite that crooked. They provide a way to "unlock" the old stuff after you've changed credit cards. It's just a nuisance, and you do need to remember the old card number in order to unlock it.

If you don't remember the old number, then you can download it again (no charge other than time and bandwidth) and it will be automatically converted to the new number, or so they say. I haven't had to try this and I don't intend to do so.

Like most DRM schemes, it doesn't really protect anything or anyone. It's just a painful nuisance.