United States trademark law
A trademark is a word, phrase, or logo that identifies the source of goods or services. Trademark law protects a business' commercial identity or brand by discouraging other businesses from adopting a name or logo that is "confusingly similar" to an existing trademark. The goal is to allow consumers to easily identify the producers of goods and services and avoid confusion.
Registration for Apple Computer Logo
A trademark is a type of intellectual property consisting of a recognizable sign, design, or expression that identifies a product or service from a particular source and distinguishes it from others. A trademark owner can be an individual, business organization, or any legal entity. A trademark may be located on a package, a label, a voucher, or on the product itself. Trademarks used to identify services are sometimes called service marks.
Bass Brewery's logo became the first image to be registered as a trademark in the UK, in 1876.
A product bearing "Linux" name, but not infringing the trademark owned by Linus Torvalds, because it falls into a different category