This document discusses copyright infringement and its key aspects. It addresses whether a work is subject to copyright, ownership of copyright, and what constitutes primary infringement such as copying or adapting a substantial part of a work. Non-literal copying can also infringe if there is resemblance and a causal link between works. Secondary infringement involves commercial dealing in unauthorized copies or communicating a copyrighted work to the public for business purposes. The document provides examples of court cases related to assessing infringement.