This article examines §51 of the Swedish Copyright Act 1960, generally known as ‘the protection of classics’ in relation to international discourses on copyright in the mid-twentieth century. The provision in §51 protects works of cultural significance by deceased authors and artists against reproductions that are considered offensive, even if the works are in the public domain. This article analyses the arguments and motives that led Swedish legislators to draft §51 and contextualises them internationally. The origin of the protection of classics is rooted in the notion of a paying public domain, a provision which existed in various countries in the twentieth century that allowed the state to collect royalties for works in the public domain. In Swedish copyright law this economic right was reinterpreted as a moral right to protect classical works. Unlike conventional moral rights, this right aimed at protecting the interests of the public rather than the integrity of the author. The protection of classics, and to an extent the notion of a paying public domain, can be seen not so much as a regulation of intellectual property but more as a statement about cultural heritage. By showing how the protection of classics operated within the international discourse on copyright law of the twentieth century, this article explores the relation between moral rights, a paying public domain and cultural heritage.