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Husband and wife YouTube stars Ethan and Hila Klein (H3H3) have won a legal case which could affect all YouTubers.

They were being sued by another YouTuber, Matt Hoss, for a video they made which criticised one of his.

Matt said they had infringed on his copyright by using clips of his video in one they uploaded to their channel.

H3H3's win could affect other YouTubers making videos who want to use parts of existing videos in their uploads.

In the video that sparked the legal case, the California-based YouTubers critiqued Matt for the writing and acting in his video, comparing it to that seen in a porn film.

They also criticised how he portrayed women in his videos.

"The Court is not ruling here that all 'reaction videos' constitute fair use," said Judge Katherine B Forrest in her ruling.

But it is the first of its kind among the YouTube community and H3H3 believe it could change things for people posting videos on YouTube.

"This is a landmark case, not just for us, but the wording the judge put in is going to strengthen fair use across YouTube," says Ethan Klein in celebrating their win.

It all relates to "Fair Use", a US law which allows people to use others' work for criticism, parody and news reporting.

Here is the H3H3 video that caused all the drama.

Since announcing their win on Twitter, H3H3 have been congratulated by other major YouTube stars including PewDiePie, Markiplier and the man who invented Minecraft.

The Fine Brothers shared their support with their one million Twitter followers.

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