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Open Source Initiative tries to define Open Source AI
(www.theregister.com)
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I think technically, the source should be the native format of whatever image manipulation program that you use. For vector graphics, there is svg format but the native editor is still preferable. Otherwise, whoever gets the end copy cannot easily modify or reproduce it, only copy it. But it of course depends on the definition of "easy" and a lot of other factors. Licensing is hard and it is because I am not a lawyer.