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Another example of "c/o" -- a celebrated author publishes a short story in a magazine, and you want to send fan mail. You could address the envelope:

John Q. Famouswriter
c/o The Editors, Guns &...

As far as I know, this wouldn't be against the law in the U.S., unless (for example) you and your wife had gotten divorced, and the judge in the divorce case had specifically forbidden you to read...