Category:Copyrighted free use provided that

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Note that:
 * conditions equivalent to notify are not acceptable
 * Wikipedia-only, non-commercial, educational, non-profit etc permissions are not acceptable

What are acceptable conditions?
 * Requirement of attribution (eg. 'link back to this website', 'the author is credited')
 * 'Share-alike' requirement of deriviative works (they must also carry these conditions)
 * That's about it.

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