At the kh that I attend, here in Melbourne Oz, there is in fact a sign stating that "no items are to be taken out from the library"
P.S. I was assigned in 2014 to collect and itemise all literature so we could have a current and comprehensive library by the school overseer. I went to great lengths to collect and collate a comprehensive array of publications including 'millions now living'. Eighteen months ago most of it was trashed and only a skeleton remains that i guessed will also be trashed.