| Summary: | The purpose of this dissertation is to analyse birthmarking techniques in order to detect code theft. A birthmark of a software is, as the name suggests, the set of unique characteristics that allow to identify that software. In order to detect the theft, the birthmarks of two programs are extracted, the suspect and the original, and compared to each other to check if they are too similar or identical. Nowadays the web applications are growing and JavaScript code is the most used in this field, therefore the theft in this area is a current problem. Because of that, the theft detection of programs developed in that language is the focus of this dissertation. Some techniques of birthmarking are analysed in chronological order and accordingly to the relevance for the theme. Each technique is analysed individually and in the end a comparison between them is made. Given that most of the techniques were not created for JavaScript, their applicability to the language is analysed. With those analysis, some conclusions about the best candidates to the final solution are drawn. The final goal is to develop a tool, that uses a birthmarking technique, to determine if two JavaScript programs were copied, in order to support code theft allegations.
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