Article 17

The proprietor of a trade mark shall be entitled to prohibit the use of a sign only to the extent that the proprietor's rights are not liable to be revoked pursuant to Article 19 at the time the infringement action is brought. If the defendant so requests, the proprietor of the trade mark shall furnish proof that, during the five-year period preceding the date of bringing the action, the trade mark has been put to genuine use as provided in Article 16 in connection with the goods or services in respect of which it is registered and which are cited as justification for the action, or that there are proper reasons for non-use, provided that the registration procedure of the trade mark has at the date of bringing the action been completed for not less than five years.