Competition law is one of the fundamental features of a market economy, the very competitive relationship between entrepreneurs is the driver of a market economy. Competition motivates entrepreneurs to operate more efficiently, resulting more efficient operations, lower prices, higher quality products, greater choice for consumers and innovations in business are achieved. For the market to function and all participants to benefit from competition, it is important that it is regulated by law and that there are mechanisms to protect competition. Accordingly, in the Republic of Croatia (hereinafter: The Republic of Croatia) competition is regulated by the Competition Act (hereinafter: PPA), and the Croatian Parliament established the Agency for the Protection of Competition (hereinafter: CCA) as the body responsible for competition protection. The legislative framework in the field of competition protection is the Competition Act (OG, 79/09) and the Act on Amendments to the Competition Protection Act (OG, 80/2013), and with the accession of the Republic of Croatia to the European Union (hereinafter: EU) The Competition Act also applies the acquis Communautaire which regulates the field of competition protection. A business secret is information that is determined as such by law, and it is information that has significant value for its owner, a value that provides him with an advantage in the market and thus has the right and interest to protect such information. The obligation to keep business secrets is a significant element of business and, accordingly, the handling of classified information is legally regulated. Business secrets have been defined and legal regulations (Law on Data Secrecy, Law on Protection of Data Secrecy, Criminal Code) valid in the Republic of Croatia that ensure data secrecy have been presented. The survey questionnaire provided respondents with information on competition and the obligation to maintain business secrets.