I am a strong supporter of the Open Source Initiative. The following is a brief excerpt from the OSI website:

"The basic idea behind open source is very simple: When programmers can read, redistribute, and modify the source code for a piece of software, the software evolves. People improve it, people adapt it, people fix bugs. And this can happen at a speed that, if one is used to the slow pace of conventional software development, seems astonishing.

We in the open source community have learned that this rapid evolutionary process produces better software than the traditional closed model, in which only a very few programmers can see the source and everybody else must blindly use an opaque block of bits.

Open Source Initiative exists to make this case to the commercial world."

I believe that the ethos stated above is something to be admired as a thought provoking, sensible and forward thinking approach to software development and licensing. As a result I have released my Petri net Modeller program under the GNU Public License in compliance with the Open Source Initiative guidelines. A download link to this program will be available soon.