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In today’s university life, teachers are often confronted with plagiarism. A special form of plagiarism is source code plagiarism typically found in programming courses at universities and schools. Detecting or even preventing source code plagiarism is by no means a trivial task. Therefore, this paper explains and discusses different methods that can be used to prevent and detect source code plagiarism. The second part of this paper is focused on automatic tools that assist in detecting plagiarism. Finally, an approach is presented which can be used to detect source code plagiarism in PLC (programmable logic controller) programs.