Based on the document name you provided ("potwierdzenie-udziału-i-zgoda-rodzica-PEŁNOLETNI..."), this appears to be a specialized form used by Polish educational or cultural institutions for school trips, competitions, or events.
Potwierdzenie Udziału i Oświadczenie Uczestnika Pełnoletniego potwierdzenie-udziaЕ‚u-i-zgoda-rodzica-PEЕЃNOLETN...
Since the participant is , the document typically serves as a declaration of personal responsibility and a confirmation of participation, often still requiring a parental signature if requested by a school or organization for insurance/emergency contact purposes. Below is a standard template for such a document: potwierdzenie-udziaЕ‚u-i-zgoda-rodzica-PEЕЃNOLETN...