In 1557 the guild of stationers was granted a royal charter and became the Stationers' Company, leading to the creation of the stationers' copyright, which was a private agreement “granted by a group of businessmen who agreed to allow one of them the exclusive right to publish a specific work in perpetuity” (Patterson & Lindberg, 1991, p22) rather than an actual law. This copyright was created for two purposes; to protect the publishers of works and to aid the government in its attempts at censorship. (Patterson & Lindberg, 1991, p25) Modern copyright differs in its goals and execution, but is in some ways based on that first version.