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The illegal copying of Windows applications is a significant problem, because MS-Windows is the most popular operating system in Korea. A software birthmark technique is one of the solutions for protecting software copyright and can distinguish software piracy using feature information from the software. The types of software birthmarks can be categorized into static birthmark and dynamic birthmark by the extraction method. In this paper, we propose a similarity measurement technique using dynamic birthmark based on an application program interface (API), and we design and implement the extraction process of the dynamic birthmark. Our experimental results show that the proposed measurement technique is better than the existing measurement technique.