A more thorough explanation:

An anticircumvention device is a tool or mechanism that is designed to prevent people from bypassing, avoiding, removing, deactivating, or impairing a technological measure that controls access to a work that is protected by copyright. This means that if a work is protected by copyright, an anticircumvention device can be used to prevent people from accessing or using it without permission.

For example, a DVD player or a TV satellite dish may have an anticircumvention device built into it to prevent people from making unauthorized copies of copyrighted material. This means that if someone tries to copy a DVD or record a TV show without permission, the anticircumvention device will prevent them from doing so.

Another example of an anticircumvention device is a digital rights management (DRM) system. This is a type of software that is used to control access to digital content, such as music, movies, or ebooks. DRM systems can prevent people from copying, sharing, or modifying digital content without permission.

Overall, anticircumvention devices are an important tool for protecting copyrighted material and ensuring that creators are able to control how their work is used and distributed.