illegal images

after taking the pictures a young ambitious :) official was ready to arrest me; a little later a much more polite gentleman askes me to present my documents and told me the place was with a restricted photography policy, as it is plainly put on their website. Unknowingly of this and of course not searching for trouble, I showed the kind gentleman the pictures I've taken and after seeing them he replied "Ohh I thought you photographed SOMETHING..." which of course wasn't the case :) so he said I may keep the pictures and... off we went

The idea was that when signs of certain restrictions appear is normal to behave accordingly, but where is "nothing" its purpose would've been pointless