The object of the graduation paper for Master’s degree is analysis of the effectiveness of the security provided by criminal law concerning informational technologies. The graduation paper analyses social change aspects related to the process of the informational society formation, it raises the question of relation between rights and propagation of informational technologies as an issue of one of the most stabile social structures. Seeking to evaluate the effectiveness of the security provided by criminal law for cyberspace, the paper provides basic notions and conspectus related to crimes to informational property, analyses standards of criminal law, determining criminal liability for crimes in cyberspace, endeavors to perceive the shortcomings of standards dispositions of this law interfering with practical applications of these standards, identifies the main problems arising while investigating crimes in the field by informational technologies. Evaluating aspects of the problem formulated in the science literature and the available empirical data, the graduation paper defends the following hypotheses: application of legal instruments in the investigation sphere of crimes in the informational field is very problematic. It is especially manifest having in mind that some dispositions of articles in Lithuanian Criminal Code section XXX are construed in such a way that the application of them cannot guarantee the success of pre-trial investigation.