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Much personal information about individuals is now stored in computer files. An unauthorized person with access to this information could use it for blackmail. Also, confidential information about a company's products or operations can be stolen and sold to unscrupulous competitors. (One attempt at the latter came to light when the competitor turned out to be scrupulous and turned in the people who were trying to sell him stolen information.)
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When can personal information be used for blackmail?
If a person has bought this information.
If a person has found this information on the Internet.
If a person has found it in the newspaper.
If a person has access to this information.