The purpose of this article is to show how, in an easy-to-implement way, you can sign and verify documents transparently.
The obvious benefit of this approach is peace of mind when the documents are opened again, safe in the knowledge that they have not been modified in the meantime.

This is especially important if you store 4D Write Pro documents as smart templates containing 4D code as external files on disk. Before executing this code you want to ensure the file was not externally modified.

Or, in the case of external documents, to be certain that they have come from the right sender and have not been altered during their digital journey.
The principle we’re about to describe applies to 4D Write Pro documents but applies to any other type of document with a few minor modifications.