This final paper deals with the concept of classified information, levels of secrecy and their division into public and private. The subject of the paper are archived documents that became available to the public after the deadline. A secret is information that is known only to a certain circle of people and must not be passed on. Each of us has an obligation to keep secrets. Revealing secrets in private life can result in a loss of trust in the people we have confided in while revealing state or business secrets is punishable by imprisonment. In 2007, the Data Secrecy Act came into force, replacing the previous Data Secrecy Protection Act. Given that the new Law on Data Secrecy determines the degrees of secrecy and the concepts of classified and unclassified data, within this final paper I will use certain terms from the Law on Data Secrecy Protection. With the entry into force of the new law, the Republic of Croatia has established the levels of secrecy by dividing them into: TOP SECRET, SECRET, CONFIDENTIAL and RESTRICTED. The protection of personal data is a fundamental human right. It is the right of every person to prevent and sanction the misuse of personal data guaranteed to us by international and national regulations. As part of this paper, I will explain the concepts of GDPR - General Regulation on Personal Data Protection and NDA - Agreement on Data Secrecy