"1. Promotion of Learning In the United States, copyright has always been used to promote learning by guarding against censorship. Throughout the nineteenth century, the copyright in literature was limited to the right “to publish and vend books.” The term “copy” was interpreted literally; an author had the right only to prevent others from copying and selling her particular literary work. See Stowe v. Thomas, 23 F. Cas. 201 (C.C.E.D. Pa. 1853) (holding that a translation of Uncle Tom’s Cabin into German was not a copyright infringement because it was not a copy of the work as it was published). This limited right ensured that a maximum number of new works would be created and published. It was not until the 1909 Act, which codified the concept of a derivative work, that an author’s right to protect his original work against imitation was established. This change more closely represents current statutory copyright law and is consistent with copyright’s constitutional mandate. As a further protection of the public interest, until 1976, statutory copyright law required that a work be published before an author was entitled to a copyright in that work. Therefore, in order to have the sole right of publication for the statutory period, the author was first required to make the work available to the public. In 1976, copyright was extended to include any work “fixed in any tangible medium of expression” in order to adapt the law to technological advances. § 102(a). Thus, the publication requirement was removed, but the fair use right was codified to maintain the constitutionally mandated balance to ensure that the public has access to knowledge. The Copyright Act promotes public access to knowledge because it provides an economic incentive for authors to publish books and disseminate ideas to the public. Harper & Row, 471 U.S. at 558 (“By establishing a marketable right to the use of one’s expression, copyright supplies the economic incentive to create and disseminate ideas.”). The Supreme Court has recognized that “[t]he monopoly created by copyright thus rewards the individual author in order to benefit the public.” Id. at 546. Without the limited monopoly, authors would have little economic incentive to create and publish their work. Therefore, by providing this incentive, the copyright law promotes the public access to new ideas and concepts. 2. Protection of the Public Domain The second goal of the Copyright Clause is to ensure that works enter the public domain after an author’s rights, exclusive, but limited, have expired. Parallel to the patent regime, the limited time period of the copyright serves the dual purpose of ensuring that the work will enter the public domain and ensuring that the author has received “a fair return for [her] labors.” Harper & Row, 471 U.S. at 546. This limited grant “is intended to motivate the creative activity of authors … by the provision of a special reward, and to allow the public access to the products of their genius after the limited period of exclusive control has expired.” Sony, 464 U.S. at 429. The public is protected in two ways: the grant of a copyright encourages authors to create new works, as discussed in section II.A.1., and the limitation ensures that the works will eventually enter the public domain, which protects the public’s right of access and use."