Fair use is the principle of US copyright law restricting the use of copyrighted material without the permission of the copyright owner. This allows you to use legal, unlicensed references or copyrighted works on the work of other authors, using a four part balance test. The point to note about fair use is that the balance test is subjective and can be explained.
DMCA stands for Digital Millennium Copyright Act, passed by the US Congress in October 1998, and was signed by law. DMCA is basically a compromise between copyright holders and service providers. It allows copyright holders to protect the mechanisms of their work, but protects service providers from liability for infringing content uploaded by their users. Statement (or deletion) of DMCA means that the copyright owner has notified the service provider that their website / service has infringing material. It is also known as "infringement notice". For example, Twitch has these guidelines for submitting DMCA statements. In essence, it will send you a written statement on who you are, whether you have infringed your rights or how they did it.
Digital Millennium Copyright Law. Under the Digital Millennium Copyright Act ("DMCA") http://lcweb.loc.gov/copyright/, we designate an agent to be notified of copyright infringement complaints related to this website Did. If there is any doubt of infringement, investigate this to the extent commercially reasonable and take appropriate measures according to DMCA. If you believe that the content is infringing the copyright of the copyrighted work, please contact us at trademark@tivityhealth.com or our company's copyright agency for notification at the end of this policy Please send an e-mail. In notification of copyright infringement complaints, include: