In the era of rapid technological development, the issue of information security is very relevant. The article discusses issues related to information security in computer systems due to the simple and quick copying of information through communication channels. The problem of information security covers a wide range of issues, from the legislature to a specific technical device. Program developers suggest the need for technical means of protection that provide a high level of information security. Experience has shown that software cannot guarantee information security. Therefore, any software must be supplemented by organizational measures that determine the rules for access and storage of information. In practice, software users face additional challenges when using security tools. This article presents a classification of guarantees and methods of self-defense, as well as methods of protection by requesting additional information.