I ran across this paper in CyberGuerilla called "The Danger of Metadata" that discusses the potential pitfalls of file metadata. If you can look past the paranoid author's foul mouth, there are some very astute points about how metadata can be used against you, from GPS information to serial numbers, leaving you vulnerable to trickery.
There are also detailed instructions on removing auto populated metadata from different file types from PDF to Word docs and JPG's. While copyright metadata is important, there are other instances where you might desire the removal of all metadata.
While I am not suggesting covering up criminal behavior, this article is worth a read merely to see the other radical side of the metadata spectrum.
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