The phrase "existing trademarks" refers to logos, brands, or names that are already registered and legally protected. These trademarks belong to specific companies or individuals and cannot be used by others without permission. Full definition
The suit filed Friday alleges that these websites violate Amazons existing trademarks and wants them to stop offering Amazon reviews for sale and help Amazon find those engaged in fake... [Read more...] (goodereader.com)
However, if proper steps aren't taken to arrive at an available name, the risk of stepping on an existing trademark can be high. (entrepreneur.com)