A copyright owner gets to do, or authorize others to do, the following things:
U.S. Copyright Code, 17 U.S.C. § 106
A copyright owner can dole out some or all of those rights to other people or entities, by transferring ownership or granting licenses. Ownership or license rights can be shared by any number of people or entities.
The copyright rights outlined above only apply to works that fit into at least one of these eight categories:
U.S. Copyright Code, 17 U.S.C. § 102(a)
Some of the categories are bigger than you might think. For instance, "literary works" includes almost all text-based media, including computer code. You can apply more than one category to a particular work. The copyright rights outlined above apply to works that fit into one or more of these eight categories.
A work also must include original creative expression to qualify for protection. The amount of originality required is pretty low, but just "sweat of the brow" is not enough. For example, writing out an alphabetical list of all Nobel Prize winners may take a lot of work, but it doesn't really contain any original expression. By contrast, if you add annotations and commentary to that list, you could own a copyright in the annotations and commentary.
Copyright does not apply to:
U.S. Copyright Code, 17 U.S.C. § 102(b)
More information from the U.S. Copyright Office:
Employers usually own the works created by employees in the course of their employment, and commissioned works ("works for hire") are usually owned by the party that commissioned them. Someone who is not a creator may acquire ownership of a copyright through a written agreement with the creator.
Copyrights can be registered with the U.S. Copyright Office by any legal owner, at any time during the term of copyright protection. Early registration (within 3 months of publication, and/or before infringements are discovered) brings some benefits if a lawsuit ever arises. There is a nominal fee for registration, and a copy of the work must be deposited with the Copyright Office. (More info: Copyright Office F.A.Q.)
Registration is required if you want to sue someone for copyright infringement in court. The infringement must occur after the work is registered with the copyright office. Individuals with works that may be offered for sale or important to a business are encouraged to register their work.
For works created today, copyright protection starts automatically as soon as a work is created, and lasts for 70 years after the death of the creator.
Because copyright terms have been changed several times, the term lengths for older works vary widely, based on a bewildering number of factors. Learn more about how copyright terms end, and works rise into the public domain.
Credit: Some parts of this guide were borrowed from the Copyright Services section of the University of Minnesota Libraries website licensed under a Creative Commons Attribution-NonCommercial License