Watch:
A lecture about Open Source, a specific kind of software licensing that gives the special right to use, modify and redistribute it. Linux, Apache, Firefox, Wikipedia are well known cases. Open source is important for companies that can give software without giving away critical innovation; companies that use non-differentiating software. About 95% of the software is non-differentiating.
Source: YouTube http://www.youtube.com/watch?v=kSoGQWGR9w4&feature=related