In today’s issue of Rzeczpospolita, Dr. Michal Markiewicz writes about trademarks, and more specifically about the obligation to use them – that is, how not to lose the granted right, who must prove the circumstance of use of the sign and how to do it, and possibly how to defend against an attack based on an unused sign and when such defense will not be effective. I invite you to read the article. Publicly available excerpt from the article: https://archiwum.rp.pl/artykul/1492253-Uzywaj-bo-stracisz.html