Movie bosses at Universal City Studios and the copyright owner of bestseller Fifty Shades Of Grey have teamed up to fight the producers of a new porn movie based on E.L. James' book.

The two parties are taking executives at Smash Pictures to court over new film Fifty Shades of Grey: a Xxx Adaptation, claiming the project is a "willful attempt to capitalize on the reputation of the book".

Fifty Shades Ltd. and Universal have filed suit, in which they state, "By lifting exact dialogue, characters, events, story, and style from the Fifty Shades trilogy, Smash Pictures ensured that the first Xxx adaptation was, in fact, as close as possible to the original works.

"Smash Pictures copies without reservation from the unique expressive elements of the Fifty Shades trilogy, progressing through the events of Fifty Shades of Grey and into the second book, Fifty Shades Darker. The first Xxx adaptation is not a parody, and it does not comment on, criticize, or ridicule the originals. It is a rip-off, plain and simple."

Universal executives own the movie rights to James' book.

Lawyers for the two companies are demanding an injunction against Smash Pictures' porn film and monetary damages, according to The Hollywood Reporter.