Is the Happy Production Line copyrighted?

Yes The author of "Happy Production Line" enjoys the legal ownership of the right of reproduction and has legal effect. Happy production line is a kind of funny animation work, which belongs to the work created by the author, so it has copyright authority. Copyright is a legal term, which is used to express the rights enjoyed by creators because of their literary and artistic works, and the legal ownership of the right to copy computer programs, literary works, musical works, photos, games, movies, etc.