It's not pure semantics, since your advertising is part of the 'deal' offered. If you say 'buy it here now!', you can't claim that it's some revocable licence, that's illegal bait and switch.

If you say 'buy a sofa now, free shipping!' and later claim that I got a revocable, time-limited licence to use that sofa, then in consumer protection laws that is perfect legal grounds to either say 'screw you, I bought it and your fine print is null and void', or request all my money back. It should be the same for digital content - permanent and with ability to transfer/resale, just as for books.