According to the title it is suggested that there is a legal matter dealing only with the protection of software. However, this is not correct. On the contrary the software protection has to be integrated in the existing legal system and legal problems with the existing legal norms, in particular those concerning patent law, copyright law and/or competition law have to be solved. Furthermore protection for a title of works can be claimed for a software program. Since the existing legal practice as well as software engineering is submitted to quick changes adequate legal remedies must always be chosen according to the concrete situation.