Exponential Technology Counsel

A patent - as you typically think of it - protect inventions, ideas or concepts. Which distinguishes it from a Design Patent, which still applies to functional items or items of manufacturability, but serves only to protect the ornamental design.    So where does Copyright come in?  Very broadly, it applies when you're dealing with non-functional expressions: with works of authorship (such as literary, artistic, or musical works).  But what does that mean from a practical perspective?  How do you know whether to go for Copyright or some form of patent protection?