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Adjective. This doesn't seem like an adjective. Consider: *"That license is copyleft." Perhaps someone can find citations to the contrary. As the purported adjective definition is doing the heavy lifting in the entry, the noun definition would need to be rewritten. DCDuringTALK 00:08, 21 January 2012 (UTC)
The sentence you gave actually seems quite ok to me... —CodeCat 00:12, 21 January 2012 (UTC)
My favorite food is cheese, doesn't mean that cheese is an adjective. Mglovesfun (talk) 10:40, 22 January 2012 (UTC)
Try to google "the most copyleft" or "more copyleft than", you'll find plenty of uses as an adjective. I've always viewed this word mainly as an adjective, unlike copyright. The (not comparable) metnion should be removed. Lmaltier 21:04, 25 January 2012 (UTC)
Even using Lmaltier's suggested searches, I don't find anything durably archived that supports this as an adjective, so I've removed it as RFV-failed. - -sche(discuss) 04:05, 11 April 2012 (UTC)