the method of the invention consists , on the one hand , in serially recording on a tape of photosensitive film a succession of volume holograms each relating respectively to an item of information of a corresponding document to be made secure , each of these holograms being accompanied by an identification and positioning code printed on the same film , in developing and in fixing the holograms thus recorded , and on the other hand in printing at the same time the identity documents with their individual identification codes which are the same as those of the respective corresponding holograms , in adding an adhesive to the holograms after their fixing , and in adhesively bonding together each hologram and the corresponding document after verifying that their respective identification codes match .