More than 2,500 authors have put their names to a letter in London’s Sunday Times as part of the Save Our Books campaign, launched in an effort to maintain the U.K.’s “copyright exhaustion” principle. The paper also ran a news story about the campaign.

Exhaustion of copyright refers to an author’s selling—or licensing of a publisher to sell—copies of their book in designated markets. It is feared that the British government will approve a relaxation of the territorial component of copyright, enabling editions meant for markets beyond Europe to be sold in the European Economic Area, including the U.K, at a lower cost than the UK editions.