Are we allowed to post our sprites, music, etc for sale?
Are there any chances of an Scirra Asset store, just like Unity's for Plugins and other stuff?
Are we allowed to sell plugins ourselves?
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I agree, this would be an intersting idea, but Scirra could possibly get into trouble if you sold someone else's intellectual property through
Scirra e.g. Steal a sprite
However, similar to the arcade, Scirra did make a place where you can post your sprites and music for free (Your Creations section of the forums)