Image copyrightJUKIN MEDIA/MXR/YOUTUBE
Image captionAbove is a still taken from one of the four videos at the centre of the controversy
Two YouTubers have been told to pay $6,000 (£4,600) or risk losing their YouTube channel completely.
MxR and Potastic Panda are known for making videos where they react to memes and other online content.
But it turns out four videos they watched have been bought up by a media company, which has slapped them with a bill for infringing its copyright.
And unless they pay, their channel could now be removed due to the nuances of YouTube's copyright system.
A channel receives a strike against it if a copyright owner formally notifies YouTube that a copyright infringement has taken place. Receiving three strikes, according to Google, results in a YouTube channel being "subject to termination".
MxR Plays is a YouTube channel which often involves 'reaction videos' - where people film themselves reacting to anything from memes to movie trailers.
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