You block the program from using an outbound connection, and use a crack to either patch it/register it.
IMO, your ISP really doesn't care if you use pirated software, because over 30% of internet users do. They just care if you download pirated music or movies, and when they get contacted by the RIAA or MPAA, they may just let you off with a warning, or may terminate your contract.
I've heard from alot of people, they just got a warning.