It's frustrating that the word 'purchase' is used for this kind of transaction. Like 'unlimited', it's use is fundamentally dishonest and vendors get away with it because everyone knows they lie.
If I buy a paperback book or a drm free ebook, that's a purchase.
If I pay for a drm movie or kindle book, that's a long-term rental.
If I buy a paperback book or a drm free ebook, that's a purchase.
If I pay for a drm movie or kindle book, that's a long-term rental.