In a perfect world - one key is for use in a single commercial product. Though obviously I don't go around checking how many games people have made with a single license ;) I'll be like WinRAR and leave it to your conscience ;)
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The demo was made using Spriter. You can achieve 60fps by using Spriter and exporting the character at the desired framerate. The source file is included IIRC.
I only exported lower FPS versions to keep package size down :)
Let me know if there's a problem with this, I'll be glad to help.