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A copyright is a subset of intellectual property law, and it's a formal legal protection for authorship. Copyright protects original works, including literary works, dramatic works and even technical works. Copyright law extends to everything from poetry and novels to architecture and computer software, and includes music, movies and most written works. Anything newly created, such as a research paper, music, photo, drawing, poem, is automatically copyrighted. The big "C" (©) is no longer required.
This option is a way for you to take your intellectual property – original content like photos, writing, designs, videos and more, and assign rights to it to be shared with the community and the world. It is not an alternative to copyright: it works in parallel with copyright. Creative Commons licensing can protect the original copyright and level of permissions the author chooses. It can also perpetuate these rights (or not, depending on the author’s choice) and encourages and facilitates re-use and sharing.
Fair use is the most significant limitation on the copyright holder's exclusive rights. Unfortunately, there are no universally accepted guidelines. Instead, the individual who wants to use a copyrighted work must weigh four factors: (1) The purpose and character of the use. (2) The nature of the copyrighted work. (3) The amount and substantiality of the portion used. (4) The effect of use on the potential market for the copyrighted work.
Public Domain Slider
The Public Domain slider is a tool to help determine the copyright status of a work that is first published in the United States. Any work published before 1923 is in the public domain, but the copyright status for copyrighted works after 1923 can be difficult to determine because of varying copyright registration requirements over the years and because the term of copyright has changed a number of times.