Copy protection

Some things are hard to copy.

Movies and games use special tools. These tools stop people from making copies. This helps the people who made them.

Companies use these tools on discs. They use them on games and music too. It helps them make money.

Sometimes these tools are hard to use. They can make things difficult for people. Some tools even act in strange ways.

It is very hard to stop all copying. A person can always try to make a copy. People keep finding new ways to do it.

Companies want to protect their work. They use tools called copy protection. This helps stop people from making extra copies of things. You can find these tools on DVDs, video games, and music CDs.

Many companies use these tools to make money. They worry that people will copy their work for free. In 1990, lost money from copying was $2.4 billion in the United States. This is why they use technology to keep their work safe.

Some people call these tools digital rights management, or DRM. DRM is a broad way to manage rights. It can even make a video rental expire after a certain time. Other tools are called technological protection measures, or TPMs. These are tools used to limit how people use a work.

Copy protection is not perfect. It is very hard to stop all copying. If a person can hear music, they can record it with a microphone. If they can see a film, they can record it with a camera. This is called the analog hole. Some people also find ways to break the digital locks. These people are often called crackers.

Companies use special tools to protect their creative work. This is often called copy protection or content protection. These measures help enforce copyright laws by stopping people from making extra copies. You can find these tools on many things like DVDs, Blu-ray discs, and video game cartridges. They are also used for music CDs and computer software. Some companies even use them for files sent over the internet.

These tools work in many different ways to limit access. One way is called node locking, which ties software to one specific computer. Another way is using floating licenses, which let a set number of people use it at once. Some software uses electronic licensing to turn on features online. There is also something called traitor tracing for downloaded files. This process can make each download unique to one user. This makes it much harder for people to share files easily.

People have been trying to manage copying for a long time. In 1990, the United States lost $2.4 billion because of unauthorized copying. This led to talks about stricter laws like PIPA. In the 1980s, software was often put on audio cassettes or floppy disks. Some people, like Jerry Pournelle, did not like these tools. He thought they were more of a bother to honest users than a help. Even in 1985, it took experts weeks to break some "unbreakable" systems.

Even with these tools, stopping all copying is a huge challenge. It is almost impossible to stop a person with a "writer" machine. There is also a problem called the analog hole. This means if a human can hear music, they can record it with a microphone. If a person can see a movie, they can record it with a camera. A person can even tap into a headphone jack to make a copy. Because of this, companies mostly try to stop casual copying rather than experts.

There are many different views on how these tools affect people. Some companies worry that losing sales to free copies will hurt them. Others think that giving away free copies might actually help them sell more. Some publishers choose not to use protection because it is too annoying for customers. Users sometimes find that these tools do not work correctly or are hard to use. This can be a hard job for companies to balance. They want to protect their money while still making sure customers are happy.

Copy protection, also called content protection or copy prevention, refers to measures used to enforce copyright. These tools aim to prevent the unauthorized reproduction of media like films, music, software, and video games. You can find these protections on many physical formats, including DVDs, Blu-ray discs, and audio CDs. They are also used for digital files distributed over the internet. While media corporations use this term, some critics prefer "copy control" or "copy prevention." They argue "copy protection" suggests the technology is always successful, even though many copies can still be made. A more technical term used by the World Intellectual Property Organization is "technological protection measures," or TPMs. These are tools used to restrict how a work is accessed or used.

There are several ways that software manages how it is used. One method is node locking, which ties a piece of software to one specific computer. Another method involves floating licenses, which are also called indirect licenses. In a floating license system, a fixed number of users can use the software at the same time across a large group, like a company. This is different from a direct license, which is issued to a specific user. For example, an activated Microsoft product uses a direct license that is locked to the PC where it is installed. Some software also uses electronic licensing, where users can purchase and activate specific features online. To keep these systems safe from hackers, companies use software antitamper methods.

Digital rights management, or DRM, is a broader concept often confused with copy protection. While copy protection focuses on stopping copies, DRM includes managing many different types of rights. For instance, DRM can manage video rentals that expire after a certain amount of time. Some forms of copy restriction are not even digital. In the world of downloads, companies use a process called "traitor tracing." This allows them to customize each download so it is unique to a specific user. This makes it much harder for someone to share a digital file without being detected.

From a business perspective, companies use these tools to protect their revenue. In 1990, unauthorized copying caused $2.4 billion in lost revenue in the United States alone. This loss of money is a major reason why companies propose stricter copyright laws, such as PIPA. Companies believe the cost of implementing protection is worth it to prevent "casual copying." Casual copying happens when consumers use machines to make copies for their friends. However, some experts argue that people who get free copies would not have bought the product anyway. Others suggest that free copies might actually increase profits by introducing people to new music or bands.

Despite these efforts, stopping all copying is a massive technical challenge. As long as a "writer" machine exists to create blank media, copies can be made. Every piece of media also requires a "player," such as a DVD player or a computer, to be read. A player could theoretically be built to read a disc and immediately write an exact copy to another one. There is also a problem known as the "analog hole." This means that if a human can hear music, they can record it with a microphone. If a human can see a film, they can record it with a video camera. By tapping into headphone jacks or speaker outputs, users can often make high-quality copies.

The history of software protection has been a long struggle between publishers and "crackers." Crackers are programmers who defeat protection systems as a hobby. In the early days, software was often shared on audio cassettes, making copying unreliable and slow. When floppy disks became common, unauthorized copying became a bigger problem. In the 1980s, experts like Jerry Pournelle argued that protection often just inconvenienced honest users. He noted that for every new protection scheme, a hacker was ready to break it. In 1985, it reportedly took crackers three weeks to break a system used by dBASE III.

Some companies have even faced backlash for how they use these tools. In the late 1980s, some Microsoft applications were criticized because their protection caused unexpected sounds or messages. This led the company to remove protection from some software. Other users found that software like Lotus 1-2-3 was difficult to use because of its security measures. In the end, the use of copy protection involves a difficult balance. Companies want to protect their work from mass duplication, but they must also ensure the product remains easy for paying customers to use.