Songs, novels, photographs, software, paintings and films all share a form of legal protection that most people never have to apply for. Copyright is automatic, long-lasting and full of exceptions, and the details matter to anyone who creates, shares or reuses material online. This overview explains the basics. It is general information, not legal advice.
What copyright protects
The power to grant copyright comes from the Constitution, which lets Congress secure to authors “the exclusive Right” to their writings for “limited Times” in order to promote progress. The modern law is the Copyright Act of 1976, found in Title 17 of the U.S. Code.
Copyright protects original works of authorship fixed in a tangible medium of expression. That includes literary works, music and lyrics, plays, pictures and graphics, sculptures, films and other audiovisual works, sound recordings, architecture and computer programs. “Original” means the work was independently created and has at least a minimal spark of creativity. “Fixed” means it is recorded in some stable form, such as written down, recorded or saved to a file.
Copyright gives the owner exclusive rights to make copies, prepare derivative works such as adaptations, distribute copies, perform or display the work publicly and, for certain works, to transmit digital performances.
What does it not protect?
The limits are just as important:
- Ideas, concepts and methods. Copyright covers the way an idea is expressed, not the idea itself.
- Facts. Basic facts and data are free for anyone to use, although a creative selection or arrangement of them can be protected.
- Titles, names and short phrases, which are generally not eligible, though trademark law may apply.
- Works of the federal government, created by its employees as part of their official duties, which are in the public domain.
- Works without human authorship. The U.S. Copyright Office has stated that it will register works only if they have human authors, and that the portions of a work generated by artificial intelligence without sufficient human creative input are not protected.
Do you have to register?
No, protection begins automatically when the work is fixed. Registration with the Copyright Office is voluntary, but it has legal consequences. For works of U.S. origin, registration (or a refusal by the Office) is required before the owner can file an infringement suit, a point the Supreme Court confirmed in 2019. Timely registration also unlocks the ability to seek statutory damages and attorney’s fees in many cases. Cases involving copyright are heard in federal court, which has exclusive jurisdiction over such claims, one of the categories explained in federal courts versus state courts.
A notice with the © symbol is no longer required, though it can discourage innocent infringement.
How long protection lasts
For works created by an individual author, protection generally lasts for the author’s life plus 70 years. For works made for hire, such as many works created by employees, and for anonymous or pseudonymous works, the term is 95 years from first publication or 120 years from creation, whichever ends first. These terms have been extended by Congress over the years. Works whose protection has expired enter the public domain, where anyone may copy and adapt them. Every January, a new group of older works reaches that status, and by 2026 works first published in the United States in 1930 or earlier had entered the public domain.
Fair use, in four factors
Fair use is a doctrine, written into the statute, that permits some uses of copyrighted material without permission for purposes such as criticism, comment, news reporting, teaching, scholarship and research. Courts weigh four factors:
- The purpose and character of the use, including whether it is commercial and whether it adds something new or “transforms” the original.
- The nature of the copyrighted work, with more latitude for factual works than for highly creative ones.
- The amount and substantiality of the portion used, in relation to the whole.
- The effect on the market for the original.
There is no fixed formula, such as a number of words or seconds that is always allowed. Outcomes depend on the facts, and courts sometimes disagree. Saying “no infringement intended” or crediting the author does not by itself make a use fair.
Lending and reselling: the first-sale doctrine
For physical copies, the first-sale doctrine lets the owner of a lawfully made copy sell or lend it without the copyright owner’s permission. That is why used bookstores and public libraries can operate. Digital works usually come with licenses that set their own terms, which is part of the story told in why streaming catalogs keep changing and in how public libraries work.
What creators and users should do
Creators can register important works, keep records of when and how they were made and be clear about who owns what in any collaboration or contract. Anyone who wants to reuse another person’s work can look for the owner’s permission, check whether a work is in the public domain, or consider licenses such as Creative Commons that allow specific uses. The Copyright Office offers free circulars and a searchable public record of registrations. For anything with real money or risk attached, a lawyer who specializes in intellectual property is the right source of advice.
Sources: U.S. Copyright Office; U.S. Constitution; Copyright Act of 1976; U.S. Supreme Court; Library of Congress
