public domain

public land; lands that belong to the government; creative works that are available for public use because they are not copyrighted or patented

Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction. This body of information and creativity is considered to be part of a common cultural and intellectual heritage, which, in general, anyone may use or exploit, whether for commercial or non-commercial purposes. About 15 percent of all books are in the public domain, including 10 percent of all books that are still in print.
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Noun
1. property rights that are held by the public at large
(hypernym) property right

(PD) The total absence of copyright protection. If something is "in the public domain" then anyone can copy it or use it in any way they wish. The author has none of the exclusive rights which apply to a copyright work.
The phrase "public domain" is often used incorrectly to refer to freeware or shareware (software which is copyrighted but is distributed without (advance) payment). Public domain means no copyright -- no exclusive rights. In fact the phrase "public domain" has no legal status at all in the UK.
See also archive site, careware, charityware, copyleft, crippleware, guiltware, postcardware and -ware. Compare payware.

public domain

openly available to everyone and not subject to copyright protection.