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Originally Posted by sun surfer
I don't really see it as murky. You could say a free category could be murky too since you could decide to pay for a better edition of a classic.
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Actually, I think it was covered pretty well in the description:
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Books that aren't generally free or very cheap
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I think it's pretty sensible to assume that public domain/creative commons works are excluded, while at the same time, if you managed to scoop up a temporary bargain on something usually priced higher you could nominate that. Seems like pretty good wording to me.