The term "'''''public domain'''''" refers to the collective of works not covered by intellectual property rights in any way whatsoever, typically because those rights either expired or never existed, but sometimes because the creator forfeits said rights. Examples of such works include the English language, the formulae of Newtonian physics, the works of Shakespeare and Beethoven, and the patents on powered flight. This also applies to many old movies, cartoons, novels, poems, comics, and various other works of art, science, and general knowledge. In general, Public Domain works make for a great resource for those who need entertainment but don't have a lot of cash.

Since Public Domain works don't have the protection of UsefulNotes/{{copyright}} or other IP rights, anyone can use them as the basis for new creative works without fear of running into lawsuits or other legal issues. Shakespeare's works, for example, have received numerous film adaptations with their own unique spin on The Bard's tales. People can also use those works, in part or in whole, within a new creative work (someone can quote as much Shakespeare as they want within a film).

In general, works enter the public domain by one of several means:

* The work existed before copyright existed (generally anything before the 1800s)
* The work got published after the creation of copyright, but existed long enough for its original copyright to have expired (anything published before 1923 in the United States)
* The work's copyright lapsed due to age (with the current legal standard for the US holding that age at seventy years after the death of the creator, or 120 years after creation/95 years after publication [whichever is less] for works where a corporate entity is the creator).
* The copyright holder waives their copyright.
* The work got published at any time between 1923 and 1977, but the copyright owner failed to renew their copyright. (After 1977, renewal became optional.)
* In the United States at least, if the work was originally created by the US Government, it is automatically in the Public Domain at creation. (this is why the ''PrivateSNAFU'' cartoons and the "Why We Fight" films of Creator/FrankCapra are in the public domain).

In the United States, a vast majority of works produced prior to 1923 have fallen into the public domain (with a few exceptions existing thanks to legal issues); works produced thereafter may or may not fall under copyright, owing to a litany of circumstances (including various extensions of copyright terms).

For certain works, international laws and treaties complicate matters further. While the [[Literature/TheBible King James Bible]] falls under the public domain in the US, over in the UK, the Crown holds it under perpetual copyright. In Germany, the government uses its perpetual copyright over ''[[AdolfHitler Mein Kampf]]'' to prevent anyone from publishing and distributing the book in that country.

Here on TV Tropes, the Public Domain comes into play via four different tropes:

* PublicDomainArtifact
* PublicDomainCharacter
* ThePublicDomainChannel
* PublicDomainSoundtrack

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!!Pages Covering Public Domain Works:

* PublicDomainAnimation: Cartoon short subjects that exist in the public domain.
* PublicDomainFeatureFilms: This covers public domain feature length movies such as TheBirthOfANation and NightOfTheLivingDead.
* PublicDomainStories: This includes folklore, short stories, poems and novels that exist in the public domain.