Um, sorry, but are you a complete idiot?

LimeWire is OPEN SOURCE! Anyone can get the source code and compile it themselves FOR FREE! No one expects that the "Pro" version uses some sort of uncrackable protection. That would be plain silly when anyone can make and distribute a perfectly legal alternate version. The idea behind any shareware is that honest users will contribute not because they're forced to, but because they wish to support the product. Now maybe you're not honest, but that's not the developer's problem. You can't pirate free software.

Sadly as far a LimeWires goes, I feel they would have done much better if they tried their Pro version before going the spyware route. You're far less likely to have the support of your users after selling them out to the ScumWare pushers.