This text offers a broad introduction to the fundamental principles of the law of trademarks and unfair competition. Although deeply rooted in the common law of torts, modern trademark law has branched in many directions, as evidenced by the development of antidilution and anticybersquatting laws, as well as state and federal registration systems. Practitioners and students of trademark law today must be familiar with all of these branches and their various sources - which include statutes as well as common law, and federal as well as state law.