Open Source Licenses Are Not All the Same
http://www.onlamp.com/pub/a/onlamp/2004/11/18/licenses.html

Fishman, Stephen
O'Reilly and Associates
2004

Abstract:

One of the most significant developments in the software and web development community in the past few years has been the increased use of open source software. It's vital for any programmer, web designer, or other computer professional to understand that open source licenses are not all the same. The differences between licenses can have a big impact on how you may use or distribute the software.