YouTube copyright strike
A YouTube copyright strike is a copyright policing practice used by YouTube for the purpose of managing copyright infringement and complying with the Digital Millennium Copyright Act. The Digital Millennium Copyright Act (DMCA) is the basis for the design of the YouTube copyright strike system. For YouTube to retain DMCA safe harbor protection, it must respond to copyright infringement claims with a notice and take down process. YouTube's own practice is to issue a "YouTube copyright strike" on the user accused of copyright infringement. When a YouTube user gets hit with a copyright strike, they will be required to watch a warning video about the rules of copyright and take trivia questions about the danger of copyright. When a YouTube user has three copyright strikes, YouTube terminates that user's YouTube channel, removes all of their videos from that user's YouTube channel, and prohibits that user from creating another YouTube channel.
YouTube assigns strikes based on reports of copyright violations from bots.
Some users have expressed concern that the strike process is unfair to users. The complaint is that the system assumes guilt of YouTube users and takes the side of copyright holders even when no infringement has occurred.
Reasons for strikes
Disagreements about what constitutes fair use
Fair use is a legal rationale for reusing copyrighted content in a limited way, such as to discuss or criticize other media. Various YouTube creators have reported receiving copyright strikes for using media in the context of fair use.
Suppression of criticism
Various YouTube creators have reported receiving copyright strikes on videos which are critical of corporate products. They claim that a claim of copyright violation is actually a strategy to suppress criticism.
Strikes for posting own work
Copyright strikes have also been issued against creators themselves. Miracle of Sound's channel was hit with multiple copyright strikes as a result of automated strikes by the distributor of their own music.
Strikes for works in the public domain
In a similar incident to such strikes, though in another forum, Sony issued an automated copyright strike against James Rhodes for a video on Facebook of him playing part of a piece by Bach, on the grounds that they owned the copyright on a similar recording, and when the strike was challenged, asserted that they owned the rights to the work, before finally admitting that Bach's compositions are in the public domain. 
Strikes for unknown reasons
Some publishers on YouTube report not understanding why they have received strikes.
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