www.blender.org/education-help/faq/gpl-for-artists/#c2128 And in this case, if you select a Copyleft license, you were effectively restricting your users` freedoms instead of improving them. They remove Blender as an option for certain types of proprietary software. This may be an interesting compromise for you, but you should understand that the GPL is not maximum software freedom. I do not think that is a problem. If people don`t want to pay for an add-on, those people would probably steal software (Blender and/or others) as well. No one with a minimum of moral commitment would share and should use add-ons without paying. What the license says is irremediable. I always pay for my add-ons. Without money, no blender, without money, no addons, that`s exactly it! I don`t think you did that. .