A sign serves to certify specific quality, precision, material, manufacture method, place of origin, or other characteristics of goods/services of others.

A sign registered in the name of union, association, or other group with legal personality indicates the goods/services provided by their members.

If a trademark has been used so much in relation to all or any of the goods or services for which it is registered that it has become exceptionally well-known in Hong Kong; and use of the registered mark by someone other than the trade mark owner on other goods or services would be likely to detract from its distinctive character in relation to the goods or services for which it has been so used; then the mark may be registered as a defensive trade mark in respect of any or all of those other goods or services, even if there is no intention to use the mark for those goods or services.