Not necessarily. In some cases, someone may have "common law" trademark rights simply by being the first to use a trademark in commerce—neither federal nor state registration is required for common law rights. Someone with common law rights can challenge your use or registration of your trademark. For these reasons, it's a good idea to check beyond state and federal registries, such as registered corporate names and use on the internet. These are included in both the WorldScan International and Federal, State, and Common Law packages.