The mark of a registered trademark marked with R refers to a trademark that has been registered by the Trademark Office of the State Administration for Industry and Commerce and obtained a trademark registration certificate. It is illegal to add a registered trademark logo to an unregistered trademark. Article 52 of the Trademark Law stipulates this illegal treatment. 3. Legal basis: Article 52 of the Trademark Law uses an unregistered trademark as a registered trademark, or uses an unregistered trademark in violation of the provisions of Article 10 of this Law, the local administrative department for industry and commerce shall stop it, make corrections within a time limit, and may notify it. If the illegal business amount is more than 50,000 yuan, a fine of less than 20% of the illegal business amount may be imposed; if there is no illegal business amount or the illegal business amount is less than 50,000 yuan, a fine of less than 1 10,000 yuan may be imposed.