Piwik is Free Software released under the GPL v3 or later (see GPL v3 guide) license. “Free software” is a matter of liberty, not price. To understand the concept, you should think of “free” as in “free speech,” not as in “free beer”.
Free software is software that gives you the user the freedom to share, study and modify it. We call this free software because the user is free.
To use free software is to make a political and ethical choice asserting the right to learn, and share what we learn with others. Free software has become the foundation of a learning society where we share our knowledge in a way that others can build upon and enjoy.
Currently, many people use proprietary software that denies users these freedoms and benefits. If we make a copy and give it to a friend, if we try to figure out how the program works, if we put a copy on more than one of our own computers in our own home, we could be caught and fined or put in jail. That’s what’s in the fine print of the license agreement you accept when using proprietary software. The corporations behind proprietary software will often spy on your activities and restrict you from sharing with others. And because our computers have access to so much of our personal information and daily activities, proprietary software represents an unacceptable danger to a free society.
For Piwik, the “free” in “free software” is used primarily in reference to freedom and not to price – although Piwik is free of charge. The most important thing about Piwik is not that it is available free of charge, but that it confers rights of software freedom on the people who install and use it. It is those freedoms that enable the Piwik community to grow, sharing its collective experience and expertise to improve Piwik.
Free software has been a coherent social movement for more than two decades. This movement has produced millions of lines of code, documentation, and a vibrant community of which Piwik is proud to be a part.
These libraries are Free/Libre software and open source. A list of libraries used by Piwik and their respective licenses can be found in the file LEGALNOTICE
You may be interested in the following FAQs:
Don’t you wish all software came with these freedoms? So do we!
The FSF advocates for free software ideals as outlined in the Free Software Definition, works for the adoption of free software and free media formats and organizes activist campaigns against threats to user freedoms such as Windows 7, Apple’s iPhone and OS X, DRM on ebooks and movies, and software patents.
Piwik.org is a proud member of the FSF.
Piwik also integrates with most of the popular open source web publishing platforms, web framework and ecommerce shops. Click on the image to learn more!