What is the fine-grained topic of the following text: In a different case, a federal district court in Virginia upheld the PTO's cancellation of the Washington Redskins' trademarks under that law, which prohibits registration of marks that consist of "matter which may disparage persons, living or dead, institutions, beliefs, or national symbols, or bring them into contempt, or disrepute. Only return the topic.
Cancellation of Washington Redskins' trademarks