The software plays a major role in the fast and ever-increasing growth of importance of computers in our life. In this regard the conclusion of software licencing agreements is becoming increasingly important. The software developed by companies or programmers cannot be sold profitably unless licence issues are regulated by contractual terms. In particular, in the relationship between companies and programmers the rights of use must be observed. To prevent problems regarding the rights of use in advance, it is necessary to achieve a detailed agreement on the scope of the use at the start of cooperation. Absence of such regulations can quickly result in disputes between the parties. The client can protect himself by making comprehensivearrangements in advance. Otherwise, he can face demands for royalties. A lawyer experienced in software law can enforce these claims or help avoid disputes by drafting comprehensive contracts.