At the time, its hard to interface with FPSC on a time limitation. I tried various things. The only thing that seemed to work well was a timed play, like 10 mins, then it shut down the game. But this could also cause a corrupt game because it kills it in gameplay.
A timelimit in days may be possible, but then the issue of clock rollback can happen and other stuff. But I will look into it.
For now, until something is developed, the standard would be to create a playable DEMO for download, and have a Full Keyed version for sale which would also be downloadble to the paid individual.
http://www.rastaworld.com
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