I suppose you could "buy" and also get a copy off of thepiratebay.org - you already paid for the license. It is teeechnically illegal because the "purchase" agreement very likely doesn't allow backups, but come on. (Also, the uploading part of torrenting is usually separately illegal)
What are people to do if they want to stay on the non-pirate/legal side of this but also prevent being royally F-ed?