Efficiency comparison of various plagiarism detection techniques

Plagiarism is using someone else ideas without acknowledging or proper citation to the source. This paper discusses various plagiarism techniques including semantic based, improved ranking based semantic, semantic and syntactic based, metrics based, fuzzy based. The study demonstrates that plagiarism detection techniques these days not only concentrate on exact copy but also to catch intelligent plagiarism like paraphrasing, restructuring of words in a sentence, technical tricks to exploit weaknesses of systems, deliberate or inaccurate use references up to some extent.