Terrorists do not always carry explosives or mallets, nor they come from overseas, it may even be people in charge of collections. We ought to deal with them to safeguard "smart books": books intelligently made, such that no material interfere with each other, on the contrary, they create formidable synergies. Each one has its peculiarities, its beauty and its function. They represent a compendium of technology, art, society and culture at the time and place in which they were created.