Public domain

Some things belong to everyone.

You can use these things for free. This includes old books and songs. You do not need to ask for permission.

Some books are very old. Many people wrote them long ago.

Rules for books can change. In some lands, rules change after many years.

This helps us learn. We can use old ideas to make new things.

Some things belong to everyone. We call this the public domain.

In the public domain, no one owns the work. You can use these works without asking for permission. This includes old books, music, and films.

Many things are in the public domain because they are very old. The works of William Shakespeare and Leonardo da Vinci are examples.

Their rights have expired. This means the time they were protected has ended. In the United States, many old books are free to use. This includes books by Edgar Allan Poe.

Some things were never protected by law. This includes cooking recipes and math rules.

Even the air and sunlight are things we all share. This idea started a long time ago with the Romans. They had rules for things that no one could own privately.

The public domain helps us learn. It lets people use old ideas to make new things. Artists can make new movies based on old stories. This keeps our culture alive for everyone to enjoy.

The public domain is a special space for creative works. It includes anything that has no exclusive owner. This means no one holds special legal rights to the work. Because of this, anyone can legally use these works. You do not need to ask for permission first.

Some works are in this space because their protection ended. Other works were never protected by law at all. This includes things like math rules or cooking recipes.

This shared space helps people learn and create new things.

How a work enters the public domain can happen in many ways. Often, the time for copyright protection simply runs out. In most countries, this happens 70 years after an author dies. Mexico has a very long rule of 100 years. In the United States, many old books are already free to use. Some authors even choose to give their work away. They actively dedicate their creations to the public.

This makes the work available for everyone to enjoy immediately. This process ensures that culture stays open to all.

This idea has a very long history. The concept can be traced back to ancient Roman law. The Romans had rules for things that could not be owned privately. They used terms like res communes for things everyone shared. This included the air, the sunlight, and the ocean.

Later, lawyers in Britain and France developed similar ideas. In the 1800s, the French used a phrase about falling into the public domain. This described the moment a work's protection finally ended. These old ideas helped build our modern rules.

Many famous names belong to the public domain. You can find works by William Shakespeare and Ludwig van Beethoven. Writers like Jane Austen and Edgar Allan Poe are also included.

In music, many old melodies are free to use. In films, some movies like Night of the Living Dead became public domain. This happened because of a mistake with copyright papers.

These works are now part of our shared history. They belong to the whole world to study and use.

Using the public domain allows people to make derivative works. A derivative work is a new thing based on an old one. For example, an artist might make a new painting based on the Mona Lisa.

A filmmaker might turn an old book into a movie. This helps keep old stories alive for new generations. It also helps people build new knowledge from old facts. The public domain acts like a foundation for all new ideas. It connects our past to our bright future.

The public domain consists of all creative works to which no exclusive intellectual property rights apply. Intellectual property refers to legal rights that allow creators to control how their work is used. In the public domain, these rights may have expired, been forfeited, or been waived. They might also be inapplicable from the start. Because no single person holds exclusive rights, anyone can legally use or reference these works without asking for permission.

Works enter this shared space through several distinct mechanisms. Many works enter because their copyright term has ended. In most nations, copyright protection lasts for 70 years after the death of the last living author. Mexico has a longer term, lasting 100 years after death for those who died since July 1928. In the United States, copyrights for books published between 1923 and 1978 lasted 95 years if properly registered. Some works, like the formulae of Newtonian physics or simple cooking recipes, are excluded from copyright law entirely. Other creators actively dedicate their work to the public through a waiver.

Different types of media have unique rules within the public domain. Books enter the domain when copyrights expire or are never granted. Project Gutenberg and the Internet Archive provide tens of thousands of these books online. Music has a complex history involving notation and recordings. While musical compositions often follow the 95-year rule, sound recordings have different protections. In the US, sound recordings might not be eligible for public domain status until between 2021 and 2067. Films also enter the domain in various ways. For example, the 1968 film Night of the Living Dead became public domain in the US because the distributor failed to include a required copyright notice.

The concept of shared resources has deep historical roots. While the specific term "domain" appeared in the mid-18th century, the idea comes from ancient Roman law. The Romans used several terms to define things that could not be privately owned. They used *res communes* for things everyone could enjoy, like sunlight, air, and the ocean. They used *res publicae* for things shared by all citizens. The modern idea of the public domain grew from these Roman legal concepts. In the 18th century, British and French lawyers used terms like *la propriété publique* to describe works without copyright.

Scholars view the public domain through different lenses. Some define it as a "negative space," meaning it is what remains after private copyrights are removed. This compares public property to private property. Others see it as a conceptual sanctuary. This view suggests the public domain should protect individual expression from being taken over by private interests. It is often described as a foundation for culture. Some use terms like the "intellectual commons" or the "information commons" to describe this shared space of ideas.

The public domain provides immense value to society. It serves as a building block for new knowledge, providing essential data, facts, and theories. It allows people to access cultural heritage, such as ancient Greek texts or Mozart's symphonies. It also promotes education by spreading scientific principles. Furthermore, it enables innovation by providing access to expired patents and technologies. This allows for low-cost access to information without the need to pay royalties. It can even support the democratic process by making news, laws, and judicial opinions available to everyone.

One of the most important uses of the public domain is the creation of derivative works. A derivative work is a new creation based on an existing one, such as a translation, an arrangement, or a film adaptation. While copyrighted works require permission for such changes, public domain works do not. This allows for massive creative expansion. For instance, the plays of William Shakespeare have been used in over 420 feature-length films. Artists also use famous paintings as starting points. Marcel Duchamp created a derivative work by using Leonardo da Vinci's *Mona Lisa*.

Ultimately, the public domain connects the past to the present and the future. It ensures that the materials of our cultural heritage remain free for all to use. This includes thoughts, words, and ideas that are necessary for a living culture. By allowing creators to build upon the work of those who came before, the public domain drives continuous human progress. It remains a vital system that balances private ownership with the collective needs of humanity.