What is the term for duplicating documents without the necessary authorization?

The correct term for duplicating documents without the necessary authorization is "Unauthorized Replication." This phrase specifically highlights the lack of permission involved in the act of creating copies of documents. It emphasizes the illegitimacy or improper nature of the action, which is crucial in counterintelligence contexts where unauthorized access or duplication of sensitive information can lead to serious security breaches.

While "copying files" may refer to the general act of making copies, it does not convey any implications about authorization or legality. On the other hand, "document forgery" suggests the alteration or falsification of documents, which is a different issue altogether, focused on deception rather than simply the act of copying. "File duplication" is also a neutral term that does not inherently imply unauthorized actions. Therefore, the term "Unauthorized Replication" best encapsulates the concept of duplicating documents without permission.