Is it Legal for Selling Clone Scripts?
First of all the clones are not exactly same like original one. There are several clone of Apps and Websites in this world. If you see there are PicMix and PicYou almost same as Instagram. You can see many of clone scripts, the only thing companies can patent is methodology for achieving an action or leading to an endpoint. If you can figure out another way to do that, without infringing on others IP, you totally can. So, if you did the you can.

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