Table of contents Introduction ; 1. Open Source Softwares - An Overview ; 1.1 Softwares and Evolution of OSS ; 1.2 Definition and Characteristics of OSS ; l.3 OSS Licenses ; l.3.1 GNU GPL ; l.3 .2 GNU LGPL ; l.3 .3 GNU FDL ; 1.4 OSS - Social perspective; 2. Market regulation of Software Market ; 2.1 Antitrust - Effects on the market; 2.2 Software market governance by antitrust regulations ; 2.3 Demystification of some basic concepts ; 2.3.1 Softwares - "Goods" or "services"? ; 2.3.2 Determining relevant market for Softwares under Antitrust law; 3. Anticompetitive Agreements ; 3.1 Exposition of Section 3 and its significance with respect to Microsoft case ; 3.2 OSS and Anticompetitive agreements by Proprietary Software developers ; 3.3 IPR as an exception ; 4. Abuse of Dominant Position ; 4.1 Acquiring dominant position in the market; 4.2 Abusive practices ; 4.2.1 Pricing practices ; 4.2.2 Non Pricing practices ; 4.3 Software enterprises abusing dominant position ; 4.3.1 US position ; 4.3.2 EU position ; 4.3.3 Indian position ; 5. Combinations ; 5.1 Legislative framework to govern software enterprises under the Competition Act ; 5.2 How combinations can yield anticompetitive results? ; 5.3 Combinations in Software enterprises ; Conclusion and Suggestions ; Bibliography.