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Rapid development of internet technologies simplified searching and sharing any kinds of data. Extremely notable is also sharing the source codes of applications. In some cases as it is for example an open source this is desirable, but often this is not wanted. Today's "copy-paste" generation is therefore a subject of more and more notable problem of plagiarism. It is present in many areas, from educational and research areas to software development. As in all similar faculties, because of the popularity of the ICT we are also facing this problem. Consequently we started a project of studying known plagiarism detection systems and developing a framework that would detect plagiarism between different types of files. At first stage we are focused on source code of applications.
Systems that detect source code plagiarism have a rich future. First systems were developed in 70s. Mostly used systems today detect similarity in programs by comparing their structure. These systems were developed as an answer to criticisms to the older systems which work by counting and comparing program's features. In this contribution, most known systems are revised and compared among themselves. Our framework and its possible usage are also presented.