We all know the Red Book, which contains lists of endangered animals and plants. Unfortunately, locks also need a similar design. Therefore, our organization decided to monitor the castles, which are in a dangerous, catastrophic state on the verge of extinction. But we are not only monitoring. The Red Book is not a death list. This is a list of candidates for the rescue. Our organisation, together with other initiatives around the world, recommends these locks for restoration, and we are also ready to provide organisational and material assistance to the owners of locks included in the Red Book.