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After nearly one year of discussions, EIP-2981 was finalized on July 24, 2021.
NFT standards (ERC-721/ERC-1155) are built on Ethereum. Broadly speaking, marketplaces transfer ownership of NFTs between collectors upon a sale. These transfer mechanisms are made easy because of the open standards that exist. These standards have facilitated the proliferation of many NFTs we see today, of course with the exception of some that predated their creation e.g. CryptoPunks, CryptoKitties.
A nice example of EIP-2981 in action can be found at this example . Here we can see royalties implemented on a per token basis. In contrast, we can also see globally applied royalties, where every token is associated with the same royalty information. This can be achieved relatively easily with some small tweaks to the smart contract.