A registered trademark confers a bundle of exclusive rights upon the registered owner, including the right to exclusive use of the mark in relation to the products or services for which it is registered. The law in most jurisdictions also allows the owner of a registered trademark to prevent unauthorized use of the mark in relation to products or services which are identical or "colourfully" similar to the "registered" products or services, and in certain cases, prevent use in relation to entirely dissimilar products or services. The test is always whether a consumer of the goods or services will be confused as to the identity of the source or origin. An example may be a very large multinational brand such as "Sony" where a non-electronic product such as a pair of sunglasses might be assumed to have come from Sony Corporation of Japan despite not being a class of goods that Sony has rights in.

Once trademark rights are established in a particular jurisdiction, these rights are generally only enforceable in that jurisdiction, a quality which is sometimes known as territoriality. However, there is a range of international trademark laws and systems which facilitate the protection of trademarks in more than one jurisdiction