A U.S. judge has ruled the cinematic release Amanda Seyfried's Linda Lovelace biopic can go ahead despite a legal challenge from the producers behind porn movie Deep Throat.

In the release, titled Lovelace, Seyfried stars as the adult actress-turned-anti-porn advocate and the film supposedly features three scenes from the 1972 hardcore movie.

Bosses at Arrow Productions launched legal action claiming they never approved the use of the porn clips in the biopic and demanded at least $10 million (£6.7 million) in compensation.

They also requested an injunction to halt the film's release later this month (Aug13), but in a ruling on Wednesday (07Aug13), a federal judge cleared the movie to hit cinemas.

Mark Gill, President of Millennium Films, the studio behind Lovelace, says in a statement, "We are relieved that common sense prevailed. The suit was completely unwarranted. We believe this case was an insult to the legal safeguards in place maintaining our right to freedom of speech. It was without merit on every level. Arrow Productions' complaint was transparent about its desire to control discussion about Deep Throat - a film they describe as a 'watershed' in American popular culture - and to hinder projects that would compete with theirs. The law does not support either of these motives."

The lawsuit is still ongoing.