It is used in cases where a living manis not in legal circulation, ie it is outside the contractual relationship in any commercial sense. In legal transactions, a natural person is obliged to use his / her first and last name, (personal identity card), while out of legal traffic it is not. How do you know if you are legal or not? Well simple. Simply showing your ID, ie identifying with it, is considered proof that you are within the legal circulation, a citizen of the Republic of Croatia (or any other state) subject to the constitutional and legal framework. If you do not identify yourself with the same claim that you are not part of this order, and officials who will at any cost want to place you in their jurisdiction (trade) will have to prove that you are not what you claim.
Although your statement that you are a living man is self evident, that is obvious, nevertheless, if the administrative persons do not trust your statement you can show him/ her an Identity card of community. It is proof that you are registered in the Register of Living People and are no longer within the legal circulation, so no service has jurisdiction over you.
You use your card at your own responsibility and in good faith towards all people, regardless of their official capacity. The card is not a contractual document, so no other or third party can claim any right over you if you identify with it. In this case, the register of living people is not a classic register, because by registering no one waives any rights, assumes new ones or gets any duties. The pass is evidence, an excerpt from the record, an eyewitness that you are a Living Man and not a natural person or any other legal person. For the same reason, there is a QR code on the card that can be authenticated electronically on the spot via a cell phone or other device that can read the qr code.