Registration of a trade mark in the Czech Republic is not conditioned by its compulsory use, but the Industrial Property Office of the Czech Republic shall in compliance with Section 25, subsection 1b cancel the trade mark from the register if in the course of proceedings initiated by a third party or ex officio it finds that the trade mark has not been used in the Czech Republic for at least five years prior to the initiation of the cancellation proceeding and its proprietor fails to present cogent reason for its non-use. Use of a trade mark by a third party based on an agreement is considered to be a proper use.