What constitutes copyright infringement?

Copyright infringement refers specifically to the unauthorized use of a protected work in a way that violates the rights granted to the copyright holder. The correct choice highlights that copyright infringement occurs when someone copies the form or expression of an idea without permission from the copyright owner. This is fundamental to copyright law, which protects the specific way ideas are expressed—such as through literary works, music, art, and more—while allowing the underlying ideas to remain in the public domain.

The other choices relate to various aspects of copyright law but do not directly define copyright infringement in the same way. Using an author's name without permission pertains more to the right of attribution, while displaying a work publicly without a license can involve separate legal issues related to public performance rights rather than direct copying. Changes made to the original work without authorization could address the concept of derivative works or moral rights but do not capture the core definition of infringement as it pertains to copying the specific expression of a work. Thus, the emphasis on copying the expression in the correct answer accurately reflects the essence of copyright infringement.