Abstract
The content of the obligation to ensure the security of data contained in the register of shareholders, emphasized by the legislature, the implementation of which rests with the entity maintaining the register, has not been developed in the provisions of the Commercial Companies Code. In the context of the potential liability of this entity for improper performance of the agreement to maintain the shareholder register, it is therefore necessary to determine the features that are important for this issue and the legal nature of such an agreement, as well as which sources of normative law specify orders or prohibitions of specific conduct, so as to ensure the security of digital data contained in the shareholder register.