Yes, they can! There are two ways they can be unlocked: - Redeemed with their tokens: Anyone who has the complete token supply can redeem the locked NFT. - Sold off: If a buyer pays the full price for the NFT, the NFT is unlocked and sold to him. There are different ways this can happen on different platforms. On Fractional.art, for instance, the buyer must initiate an auction bid. On NFTX, however, any buyer can instantly buy the locked NFT. When the locked NFT is sold, F-NFT holders are entitled to a percentage of the proceeds based on the number of tokens they own. Also, NFT ceases to be an F-NFT when it is unlocked.