Beware: not every infringement of a renowned brand is actionable
The court may refuse to find unfair competition even if the grounds are met, if the facts in the case show that the holder of a renowned trademark did not take action against infringements for an extended time.

Not every use of a trademark is sufficient to maintain registration rights
Placing a trademark on items given free-of-charge to customers does not constitute “genuine use” of a trademark required to maintain the registration.

Tiffany to shoemaker: don't tread on me
A renowned trademark may be protected in Poland even if the mark is not used or registered here.
