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Abstract: In 2006–2008, as part of the priority national project «Education», more than 50,000 educational institutions of the Russian Federation were connected to the Internet. However, along with useful and necessary information that contributes to obtaining new knowledge and building an effective learning process, students have access to resources that contain undesirable content (aggressive, unethical, etc.). In order to protect students of educational institutions of the Russian Federation from illegal and aggressive content in 2006–2007 a Federal system of access exception to Internet resources incompatible with the tasks of education and training of students of the Russian Federation was developed and implemented. According to the Federal law of the Russian Federation of December 29, 2010 № 436-FZ «On protection of children from information harmful to their health and development» by September 1, 2012. it is obligatory to install a personal content filter on each computer in all educational institutions in the territory of the Russian Federation. Content-filter is a device or software to filter sites by their content, which does not allow access to certain sites or services on the Internet. Means of content filtering of access to the Internet are hardware-software or software systems that provide restriction of access to Internet resources that are incompatible with the objectives of education and upbringing of students. This article describes the main provisions related to the filtering of network content: laws governing the Internet, technical methods of filtering network traffic, existing modern content filters their capabilities and shortcomings. The system of content filtering «Selecta», which is designed to filter Internet traffic for educational institutions, developed at the Department of Informatics, Information Technologies and Methods of Teaching Informatics of the Ural State Pedagogical University in cooperation with IDECO SELECTA Ekaterinburg, is proposed.