Article 92, paragraph 3 a), b) and c) gives some requirements concerning the use of a trademark:
A registration may not be revoked on the ground of paragraph (1) of this Article, in the case of any of the following uses of the registered mark in connection with the goods or services referred to in the registration:
a) use made under a licence contract recorded in the register of marks;
b) use of the mark in a modified form, which does not alter its distinctive character;
c) use of the marks in publicity and business correspondence.
