We once had a contractor who used our printer to print out a letter to a competitor, offering to sell them our source code. Unfortunately, one of our employees visited our printer at the wrong time (for the contractor)...
http://blog.erratasec.com/2017/06/how-intercept-outed-realit...
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Its never been easier to send an email than now
This was in the early 90s. We didn't have internet yet.
It's certainly a civil tort.