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, , 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 , "you can completely avoid any issues related to copyright by simply licensing videos on our website.
"In effect, you're taking other peoples' videos without asking them, then posting them to your channel and making money off of them.
"We never want to issue copyright strikes - we have a duty to do so to protect the copyright of the creators who have signed with us."
Do the YouTubers have to pay?
Leonard J. French is a copyright lawyer based in the United States who is also a YouTuber with more than 100,000 subscribers.
He told the BBC that the question being brought up by commenters online is whether the YouTubers should pay at all - or if their video falls under the legal principle known as fair use.
"It's very possible that MxR Plays are not making a fair use," he said. "But I and my fellow attorneys don't actually know how a judge or jury would find if this went to a trial because fair use is such an in-depth analysis.
"It's right on the line. Did this channel make enough additional commentary or criticism to overcome the hurdles to fair use, or did they just republish the original material without adding enough transformative content to make it a new material?
"That's the difference between no damages and massive damages with nothing in between."Lawful Masses with Leonard French Report
He said that according to US copyright law (specifically 17 U.S.C. section 106-7), there are four points which need to be addressed to ascertain whether something qualifies as fair use or not.
How to tell if your video might qualify as fair use according to Leonard J. French
The copyrighted part of the video has been transformed into something new, such as commentary or criticism
The original copyrighted work is not being used for profit, as opposed to being used for commercial purposes
A very small proportion of the original copyrighted work has been used (such as a single frame from a video), with more original content added
The video has not usurped the market - meaning people do not need to watch the original anymore
Leonard said that while $6,000 may seem like a lot, it could potentially be a lot more if the issue ever went to court.
"As a copyright attorney working in this field," he said, "I can say this is a normal demand and may even be a reasonable demand.
"But there are different ways to calculate damages in the US. If Jukin Media has registered the copyrights before making this claim, they could get damages up to $150,000 (£115,000) in court.
"If they have not registered the copyrights, they would only be able to claim actual damages, which are the original fee for the video's use ($49/£37) plus attorney's fees.
"Legally it's not an issue to make a demand for $1,500, but it seems morally outrageous to go after a channel like this for that much money per video."