Notice has three parts. Next, the name of the author. Finally, the year in which the work was completed. The company is usually considered the author of works done within the scope of an employee's duties. This generally means that they last as long as the trademark or trade dress is being used with some exceptions, including the mark becoming generic.
Registrations require renewal.
Independent discovery is not a defense. Protectable Anything that indicates source, sponsorship, affiliation, or other relation of a product or service to a particular business. The specific identity of the business does not need to be known. Type of Protection Prevents consumer confusion as to the source of products or services. There is a smaller trend that trademarks are like property and diminishment of value through dilution is actionable.