Open access

Some research papers are free to read.

This is called open access. Usually, people must pay to read these papers.

But open access lets anyone see the work. This helps doctors find new ways to help sick people. Authors can also share their work on their own websites. This way, the work is free for everyone. It is a great way to share what we know.

We can all learn more this way.

Many research papers are kept behind paywalls. This means people must pay to read them.

Open access is a way to share research for free. It lets anyone read and use the work.

This is very helpful for doctors. They need the newest facts to treat sick people.

There are different ways to do this. In the gold model, the publisher makes work free right away. Often, the authors or their schools pay a fee. In the green model, authors put their work on a website for free.

This is called self-archiving. Some journals are hybrid. They have both free and paid articles.

Some journals are called diamond journals. These are special because they do not charge readers or authors. They get money from gifts or groups. There are over 350 of these journals. Other people use sites like Sci-Hub to get papers for free.

This is not always allowed by law. Still, many people want to share knowledge with the world.

Open access is a set of ideas and rules for sharing writing.

Usually, people must pay to read certain research papers. These papers are often kept behind a paywall. Open access removes these barriers so anyone can read them for free. This is very important for scientific research. For example, a doctor treating a very sick patient needs the newest facts. They cannot wait or pay for old articles to help someone right now.

There are many different ways that researchers share their work. One way is called the gold model. In this model, the publisher puts the article online for free right away. Many gold journals use an "author-pays" system. This means the person who wrote the paper pays a fee to publish it. Another way is called green open access. In this model, the author saves a version of their work on their own website. This is called self-archiving. It is a free way for authors to share their findings.

Some journals use a mix of these styles. This is known as hybrid open access. These journals have some articles that are free and some that cost money. Some people call this a "Mephistophelian invention" because it can be confusing. In these journals, both the readers and the authors might end up paying. There is also a type called bronze open access. These articles are free to read on the publisher's website. However, they do not have a clear license for people to reuse them.

Special journals called diamond or platinum journals are very helpful. These journals do not charge the readers any money. They also do not charge the authors any fees. They get money from outside sources like gifts or government grants. There are now more than 350 platinum journals in many different subjects. These journals are often small and may use more than one language. This helps more people around the world join the conversation.

Sharing knowledge is a big goal for many people. Some people use sites like Sci-Hub to find papers for free.

This is often done without permission from the owners. Scientists also use a rule called FAIR to make data easier to find. FAIR stands for findable, accessible, interoperable, and reusable. This helps make sure that research can be used to help others. By sharing work openly, the world can learn and grow faster.

Open access (OA) refers to a specific set of principles and practices in scholarly publishing. These practices ensure that research publications are delivered to readers without access charges or other barriers.

While many publications are protected by copyright, open access seeks to make them available to everyone. This movement focuses heavily on peer-reviewed research literature, particularly academic journals. This focus exists because academic journals have faced a "serials crisis" unlike fiction or news media. In many academic fields, researchers cannot simply substitute a paywalled article with older, free information. For example, a physician treating an emergency requires the most recent clinical reviews. They cannot rely on a 90-year-old article published before modern medicines like prednisone were invented.

To understand how open access works, one must look at the different funding models. In traditional publishing, journals cover costs through subscriptions, site licenses, or pay-per-view charges. Open access journals instead rely on author fees, public funding, subsidies, or sponsorships. This shift is possible because electronic publishing costs are much lower than paper distribution. Furthermore, authors of research papers are generally not paid for their work. Therefore, they do not suffer a direct monetary loss when switching to open access. This allows the knowledge to flow more freely to the global community.

Scholars often use a color-coded system to describe different types of open access. Gold open access is one of the most common models. In this system, the publisher makes all articles available for free on their website immediately. These articles often use Creative Commons licenses, which allow for sharing and reuse. Many gold OA publishers use an "author-pays" model. This involves an Article Processing Charge (APC) paid through grants or institutions.

Green open access involves a process called self-archiving. In this model, authors post their work to a website they control. This could be a personal site, a research institution's site, or a central repository. This method is free for the author. If the author archives a version that has undergone peer review, it is called a "postprint." This is often the accepted manuscript returned by the journal.

Some journals operate as hybrid open access models. These journals contain a mixture of both open access and closed access articles. They are partially funded by subscriptions, but individual articles become open if the author pays a fee. This model is often controversial due to a practice called "double dipping." This occurs when both the authors and the subscribers are charged for the same content. Because of this, some call hybrid OA a "Mephistophelian invention."

Other specific models include bronze, diamond, and platinum open access. Bronze OA articles are free to read on a publisher's page but lack a clear reuse license. Diamond or platinum OA journals are unique because they charge neither the readers nor the authors. These journals rely on external funding like advertisements, philanthropists, or government grants. There are currently over 350 platinum OA journals across many disciplines. These journals are often small and frequently use multiple languages to reach more people.

There is also a distinction between "gratis" and "libre" open access. Gratis access means the content is free to read online without the right to reuse it. Libre access means the content is free to read and includes rights for reuse. These reuse rights are usually managed through Creative Commons licenses. All such licenses require at least the attribution of authorship to the original creators. In 2012, the number of works under libre open access was increasing rapidly.

Finally, open access connects to broader scientific standards like the FAIR principles. FAIR stands for findable, accessible, interoperable, and reusable. These principles were proposed in March 2016 and endorsed by the G20. It is important to note that FAIR data can sometimes be restricted by authentication. Therefore, only FAIR data without access restrictions is considered truly open access. This movement continues to evolve through debates over business models and research evaluation.