Forgery

[Sonia]

The act of forging, fabricating, or producing falsely;
esp., the crime of fraudulently making or altering a writing or
signature purporting to be made by another; the false making or
material alteration of or addition to a written instrument for the
purpose of deceit and fraud; as, the forgery of a bond.

[Sommer]

Document or text made to look as if it was signed/acknowledged by someone else.

[Justin Bieber]

the art of making and editing maps on halo 3

[Julene]

The action of forging a copy or imitation of a document, signature, banknote, or work of art.

[Dave Paprocki]

an illegal copy of a document, painting, etc. or the crime of making such illegal copies: