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Metadata | Surveillance Self-Defense
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Surveillance
Self-Defense
Self-Defense
Metadata
Metadata (or "data 
about data") is data that describes a piece of information, apart from the information itself. So, the content of a message is not metadata , but who sent it, when, where from, and to whom, are all examples of metadata. Legal systems often protect content more than metadata: for instance, in the United States, law enforcement needs a special warrant to listen to a person's telephone calls, but claims the right to obtain the list of who you have called far more easily. However, metadata can often reveal a great deal, and will often need to be protected as carefully as the data it describes. The U.S. legal system is slowly recognizing this.