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CC-BY-SA is probably the most common variation used on both Wikipedia and Commons (it is also in a way compatible with the GFDL used by default). Any limitations might disqualify it as free enough for Wikipedia (most notably, free images here must allow for commercial reuse (again, for GFDL compatibility, I presume), so NC is out of the question), though I'm not an expert on this. You can check the upload wizard, follow the own work path and see the available choices. Though you might also seriously consider uploading the image to Commons instead (to allow wider use). 13 "