A group of music publishers and songwriters have claimed in a copyright lawsuit that Fullscreen, which operates a network of popular YouTube channels, is including unlicensed music in its videos.

According to a statement from the National Music Publishers Association (NMPA), leaders allege that Fullscreen "directly profits from advertising revenue generated by unlicensed music videos on their channels, but does not compensate songwriters or publishers."

Fullscreen is an MCN that services over 10,000 YouTube channels, including those owned by NBCUniversal, Nintendo, and Lexus, according to the NMPA complaint. The publishers also say those channels generate billions of views each — and presumably, lots of money.

David Israelite, NMPA CEO, said in a statement, "Fullscreen's success and growth as a digital business is attributable in large part to the prevalence and popularity of its unlicensed music videos."

A Fullscreen representative was not immediately available for comment.