Abstract
The financial services market covers many diverse areas of activities conducted by entities subject to legal regulation because of the need to protect the interests of market players, in particular non-professional ones, since the basic legal priority of the legislator is to protect economic interests of mass (small) investors. The information relating to those investors as well as their transactions and the financial assets they already have is sensitive data. Hence, all activity areas of financial institutions incorporate the category of legally protected information the nature of which depends on the specificity of a financial institution’s business. In this context it is necessary to specify in detail categories of classified information, which structurally – although similar – are subject to different regulations.