In the modern world, more and more documents and services are made available in digital format. Even if it can be a source of huge progress for all humankind, this phenomenon often happens through technologies which become obsolete in a few years, are incompatible with each other or cannot be afforded by everybody. This fact creates serious obstacles to a really free communication among people, to the preservation of the cultural and spiritual heritage of humankind and to the diffusion of the Word of God.