The circle R is a sign of a registered trademark, which indicates that the trademark has applied for registration in the State Trademark Office and has been approved by the Trademark Office to become a registered trademark.
Marking R on the logo of a commodity or service means that the logo is a registered trademark and enjoys legal protection. Enterprises that provide goods or services enjoy the exclusive right to use trademarks, and others may not use them without permission, otherwise the trademarks will be infringed.