HarperCollins acquired Houghton Mifflin Harcourt for $39 million dollars in May. The publisher wasted no time in changing terms for digital content that is being distributed to public libraries. In a notice sent to library customers, ebook titles from Houghton Mifflin Harcourt will change from one copy/one user perpetual access model to 26-lend metered access model, one copy/one user on August 1.