A Manhattan judge has thrown out a $1 billion copyright case filed against Google by media giant Viacom.
Viacom had accused Google of allowing its YouTube service to show copyrighted material without Viamcom's permission, reports BBC News.
Judge Louis Stanton stated: "Mere knowledge of prevalence of such activity in general is not enough. The provider need not monitor or seek out facts indicating such activity."
Google had argued that it was entitled to 'safe harbour' under the Digital Millennium Copyright Act, as Viacom had not given it sufficient notice of specific offences.
The judge agreed to the safe harbour provision, acknowledging that YouTube had removed the illegal content as soon as notice was provided.
Google, in a statement posted on its official blog said: "This is an important victory not just for us, but also for the billions of people around the world who use the web to communicate and share experiences with each other."
Viacom has said that it plans to appeal against the ruling.