There is one public domain, which is the label assigned to that which is offered to or is available to the public, as opposed to having specific restrictions with regard to use. Copyright limits or forbids the use of a particular work (writing, art, music, theater, poetry, etc.) without permission of the copyright holder. When a copyright expires, the work moves into "public domain," meaning that anyone can use it free of charge and without permission. The works of Shakespeare, for example, public domain.