Comment by mort96

This isn't necessarily only about copyright infringement (though it's definitely that too). If some of the source code on your machine contain sensitive information, like API keys, database passwords, etc.

Legally, the word "theft" isn't only used when one party loses anything; a victim of identity theft doesn't lose their identity, yet we don't call it "identity infringement". I'm not familiar enough with US law to know for sure, but it wouldn't surprise me if the word "theft" is used somewhere for obtaining sensitive information without permission.