Such transgressions have got Jonathan Zittrain, director of the Berkman Center for Internet and Society at Harvard University, thinking about how to ensure that data are protected for the promised time period. Among other concerns, he worries for philanthropic donations of papers or personal effects to libraries and the like. Often, such donations are made with a proviso that they not be revealed for a fixed period of time. “That type of donation will not happen if their stuff is only one subpoena away from disclosure,” he says.

via Cryptography: Note to future self | The Economist.