Disinformation is a phenomenon that is appearing more and more often in public debate and which, at the same time, poses a significant threat to the functioning of the state and society. In the European Union, actions have been taken for many years to counteract disinformation on the Internet. These actions consist of both regulatory initiatives (e.g., the Digital Services Act) and self-regulatory ones, such as codes of conduct for combating disinformation developed by international organizations and industry associations. Disinformation is one of the most important challenges to democratic processes, leading to a growing lack of trust in the media and government sources. The concept of disinformation itself is difficult to define because it is necessary to find a balance between guaranteeing an individual the right to freedom of speech and the need to impose restrictions aimed at combating false or distorted information. Currently, this difficulty is additionally influenced by the widespread use of generative AI.