James Boyle, The Public Domain (2008). An excellent overview of copyright law and the nature of intellectual property, and an argument for limited copyright. See my review.
Peter Baldwin, The Copyright Wars (2014). A comprehensive comparison of copyright law between America and Europe; while American law focuses on limited terms so authors may earn a profit before the work lapses into the public domain for the benefit of everyone, Europe focuses on author’s rights as the intellectual creators of their work. These rights cannot be given up, even if the work is sold or produced for hire. America has gradually imported the European conception, extending copyright terms to unreasonable lengths.
Peter Suber, Open Access (2012). (Naturally available with open access.) A comprehensive argument for open access, a review of its practical details, and discussion of how it can be implemented widely for scientific research.