Plagiarism

Plagiarism is the act of a person using somebody else's created work and passing it off as their own original creation without any changes or giving credit to its original creator.

Mainstream Smurfs Media
Within the universes of mainstream Smurfs media, plagiarism has been the topic of at least one cartoon episode "Harmony Steals The Show", as Harmony had signed a deal with the ghost musician Ghostwriter to use his completed symphony as Harmony's own work in exchange for Harmony becoming Ghostwriter's permanent "live entertainer" at his nightclub. The Smurfs took the matter before a judge and proved that Ghostwriter's "original symphony" actually consisted of pieces of work stolen from other musicians, thus having Ghostwriter be judged guilty of perjury and freeing Harmony from his deal in the process.