in relatively few known cases in which police or prosecutor requested cryptographic keys from those formally accused and these requests were not fulfilled, no further consequences were imposed on the accused. there's no specific law in this matter, as e.g. in the uk. it is generally assumed that the polish criminal procedure code (kodeks postępowania karnego dz.u. 1997 nr 89 poz. 555.) provides means of protecting against self-incrimination, including lack of penalization for refusing to answer any question which would enable law enforcement agencies to obtain access to potential evidence, which could be used against testifying person.