(Reuters) – A U.S. judge on Thursday ruled that “Vape: The Musical,” which mocks the blockbuster 1978 film “Grease,” amounted to fair use and did not infringe the rights of owners of the “Grease” copyright.

Chief Judge Laura Taylor Swain of the Manhattan federal court said Sketchworks Industrial Strength Comedy, the Atlanta troupe that created “Vape,” transformed “Grease by updating it for the #MeToo era and exposing its misogynistic tendencies.

Written in 1971, “Grease” ran on Broadway from 1972 to 1980, while the film starred John Travolta and Olivia Newton-John.

“Grease” depicts the ups-and-downs of relationships between Danny Zuko and Sandy Olsson (Dumbrowski in the musical) and among their friends, as they navigate senior year at fictional Rydell High School in the late 1950s.

“Vape” had the same characters and a similar story.

But it had many differences, including by using millennial slang, highlighting how the teenage characters randomly burst into song and dance and “looked at least 30,” changing “Greased Lightnin’” to “Prius Lightning” and faulting the “happy ending” where Sandy underwent a radical makeover to win Danny’s heart.

In a 22-page decision, Judge Swain said that by keeping the “Grease” characters and plot arc while changing the script and lyrics, “Vape” “comments on how misogynistic tendencies have both evolved since ‘Grease’ was developed and remain the same.”

She distinguished the case from a March 2021 appeals court decision that Andy Warhol violated federal copyright law by drawing on a photograph of Prince for a series of images of the rock star, because the images were not transformative.

“Here, in contrast, ‘Vape,’ when considered holistically, constitutes a parody of ‘Grease’ ... and thus constitutes fair use,” she wrote.

Sketchworks sued after the defendants, representing “Grease” co-authors Jim Jacobs and Warren Casey, sent a cease-and-desist letter, forcing the August 2019 cancellation of performances of “Vape” in Manhattan.

Sketchworks plans to stage “Vape” in Atlanta and other cities soon. “We stood up for what we believed-what we knew-was right,” co-owner Brian Troxell said in a statement. “The right to parody is too important not to fight for.”