Gives an overview of the current legal situation regarding the use of open source software licences. - Съдържа: Introduction -- Origins of open source -- Open source in practice -- Open source and private law -- Open source and copyright law -- Open source and patent law -- Enforcement of open source licences -- Concluding remarks -- Practical recommendations -- Annexes: 1. GNU general public license -- 2. BSD and MIT -- 3. Mozilla public licence [MPL 1.1] -- 4. Fiduciary licence agreement [version 1.0].*