 Finally, consider the contentious, yet established, idea/expression rule of copyright. Copyright only applies to fixed expressions, not to the ideas that may make up a fixed expression. For example, someone may read Darwin’s original writings on evolution, express these ideas in her own words, and obtain a copyright in the new expression. This individual may be guilty of plagiarism, but so long as her expressions are not copied from Darwin’s original or substantially similar to the original, she can obtain a copyright. Copyrights and patents require disclosure and thus the ideas that make up these intellectual works may be discussed and analyzed.