Licenses of Open Source Software and their Economic Values

Licenses of open source software (OSS) are quiet various but can be categorised into three. That is GPL (GNU general Public License) like, LGPL (GNU Lesser general Public License) like, or MPL (Mozilla Public License) like. Although there are numbers of licenses, most of OSS projects are accepting GPL or GPL compatible. In reality GPL is one of the most effective powers for distribution; self-reproduction system in it. More over it also has economic "positive network externality". This mean that open source software is better for basis of social infrastructure.