IDP is a personalized digital watermark placed in the background-print of the document. It’s a security feature developed for personal documents without a photo. IDP contains personalized data chosen from the document itself. This can be placed into a decoration element and printed together in one round with the document text. The feature is offered mainly for issuing authorities of the documents below. IDP is suitable for birth-, death-, marriage-certificates, land and vehicle ownership certificates, university diplomas, notary documents, government documents with restricted circulation, contracts, legal documents etc.