If you wanna take photos inside the Royal palace area, you have to pay an extra fee. I was tired of paying extras, so I decided not to pay. Thus, I left my digital camera at a cloakroom at the entrance (free).
BUT I had my reflex camera in the rucksack, so once inside I dared to take it out and make some pics (2 or 3 only). None seemed to notice or ask me for the camera fee ticket, so I made the pics "for free" :-)