Signature forgery refers to the act of falsely replicating the signature of another person.\n\nWhat is it called when you copy someone's signature?
Let’s work this out in a step by step way to be sure we have the right answer.
Signature forgery
The relevant sentence in the passage is: Signature forgery refers to the act of falsely replicating the signature of another person.

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So, the final answer is Signature forgery