if, as i assume, you're talking about the pirate bay,many have tried and failed before you:

The Pirate Bay - The world's largest BitTorrent tracker

you're very unlikely to convince them to remove the torrent from their servers, despite what online lawyers with dollar signs in their eyes might tell you. since the torrent file itself does not contain the copyrighted data, merely instructions on where to find pieces of it strewn across the bittorrent network, under swedish law there is nothing illegal going on.

i'd recommend including at least a basic protection/authorisation system, since some people may be put off using cracking software by the threat to their machine's integrity, or their antivirus software might pop up and scare them into not running the crack. however if someone's able to find and download a torrent they're probably fairly web savvy and might go ahead and take the risk.

the double layer of serial number and authorisation number (used in many Adobe products for example) seems to confuse the less determined cracker and might reduce the overall number of successfully cracked versions in circulation.

as for the SERP problem, you could consider adopting a 'reputation management' technique and building multiple pages and blogs referring to the product and SEOing them hard to push the offending bittorrent listing down off page one.

i'd advise you not to spend effort trying to get the genie back in the bottle - focus on version 1.1 and what protection features you're going to include.