Re:None at all (Score 1)

In the work place, most people might enter a fake installation code for example, but won't go as far as to apply a crack. If the software requires you to apply a crack to use it, then I think most people at work will get their company to buy it.

I agree. To take things one step further, use a hardware key. They plug into a USB or parallel port and don't get in the way. The software has to check for the key from time to time so a user can't keep passing it around to launch the app on multiple computers. If you don't find it, warn the user to put it back or you'll shut down. If they start the app without it then it should run as a timed demo.