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Data portability gives users the right to access and transfer their data from the companies that hold it. Back-end interoperability would require very large companies—those that dominate a particular market segment—to maintain interfaces that allow their users to interact fluidly with users on other services. Finally, delegability would require those large companies to build interfaces that allow third-party software to interact with their services on a user’s behalf.
From Privacy Without Monopoly: Data Protection and Interoperability | Electronic Frontier Foundation:
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