That phrase could mean several things. It could refer to a letter that is protected by copyright, or a letter allowing use of someone's copyright (i.e., a license).
It just means general copyright, as a concept, as opposed to a specific right on a specific material. A generic copyright letter is basically a form letter to alter as needed.
The letter "c" refers to "copyright". The circle-C symbol is easily recognized, even by people who do not understand English.
C and it is inside a circle
copyright laws
When receiving a cease and desist letter for copyright infringement, it is important to carefully review the claims made in the letter and seek legal advice if needed. It is advisable to stop the infringing activity immediately, respond to the letter in a timely manner, and consider negotiating a resolution with the copyright holder to avoid potential legal action.
If you draw something, it's automatically protected by copyright. Otherwise... "register" is way too long.
Copyright.
If a company receives a copyright infringement cease and desist letter, they should immediately stop using the copyrighted material, seek legal advice, respond to the letter in a timely manner, and consider negotiating a resolution with the copyright owner to avoid potential legal action.
Indeed. The copyright symbol, ©, indicates the work is (or was) protected by copyright; such notification is not required for protection on publications after 1989 in the USA. Many works published prior to 1963 had © or "copyright" notice, but expired after 28 years.
At the end of the movie will be a copyright notice telling you who the copyright holder of record is. That would be a good place to start.
Parentheses
Bombsight, copyright, foresight, logarithm, moonlight, topflight, cockfight, downright, footpaths, moustache and toothache are nine letter words.