None, because digital storefronts are constructed in such a way as to deny the right of first sale. There's no reason this has to be the case; Steam for instanc

None, because digital storefronts are constructed in such a way as to deny the right of first sale. There's no reason this has to be the case; Steam for instance could just revoke your license, turn the game into a giftable copy like any other, and let it be listed on the marketplace.