Espionage, how to recognise and counter it

AIVD informs organisations so that they can protect themselves against espionage.

Espionage is of all ages and it poses a serious threat to the Netherlands. At the same time, espionage is almost imperceptible and few people are aware of the dangers. All sorts of countries spy in and on the Netherlands. Not just digitally, but also in the classic sense, by using people. Why do they do this and why is this harmful? More importantly: how do you recognise espionage and what can you do to counter it?