Copyrights are for artistic works (e.g., sculptures, books, music, etc.). The name of a product cannot be protected by a copyright.
Trademarks protect the name of a product. When you begin selling a product using a trademark, you gain common law trademark rights. Those rights are closely limited to the chosen trademark for the goods sold in the geography in which the product is sold. If a second company begins selling the same goods in the same geography using the same name, they can be sued for infringing the common law trademark rights.
Original content in copyrights are normally used to differentiate derivative works. Stephen King wrote Carrie. Then, a movie was made based on the story. The movie has some content that was entirely from the book and some that was original content. A copyright on the movie normally only protects the original content.
Answered on Dec 16th, 2013 at 10:56 AM