I used to have the trial version of Jasc Paint Shop Pro for a while. Dunno if they've fixed this little bug with it or not, but once upon a time, if you set your computer's calendar back to a date that was still under the trial period, it would keep going until the calendar reached the date that the trial period expired again. I think I used the 30-day trial version for over a year before I finally got my grubby little mits on a copy of Photoshop LE that came with my tablet.