How much does this cost?

NagiosQL has been released under the New BSD License. This effectively means it's free (you should be jumping up and down now). The licenses have few restrictions compared to other free software licenses such as the GNU General Public License or even the default restrictions provided by copyright, putting it relatively closer to the public domain.

Please do read the license carefully and make sure you understand the implications of it: BSD License.

Short summary of what the GPL license means

Source: wikipedia.net

The New BSD License grants the recipients of a computer program the following rights, or "freedoms":

• The freedom to run the program, for any purpose.
• The freedom to study how the program works, and modify it.
• The freedom to redistribute copies.
• The freedom to improve the program, and release the improvements to the public. (Access to the source code is a precondition for this)

Any licensee accepting the terms and conditions is given permission to modify the work, as well as to copy and redistribute the work or any derivative version. The licensee is allowed to charge a fee for this service, or do this free of charge.

Redistribution

Source: linfo.org

The only restrictions placed on users of software released under a typical BSD license are that if they redistribute such software in any form, with or without modification, they must include in the redistribution (1) the original copyright notice, (2) a list of two simple restrictions and (3) a disclaimer of liability. These restrictions can be summarized as (1) one should not claim that they wrote the software if they did not write it and (2) one should not sue the developer if the software does not function as expected or as desired. Some BSD licenses additionally include a clause that restricts the use of the name of the project (or the names of its contributors) for endorsing or promoting derivative works.

GPL vs. BSD

Source: linfo.org

Possibly the biggest difference between the GPL and BSD licenses is the fact that the former is a copyleft license and the latter is not. Copyleft is the application of copyright law to permit the free creation of derivative works but requiring that such works be redistributable under the same terms (i.e., the same license) as the original work.

Closely related to this is the fact that, in sharp contrast to the GPL, BSD-style licenses do not require that derivative works based on BSD-licensed software make the source code for such derivative works freely available. This allows the direct incorporation of code from open source projects (i.e., from BSD-licensed software) into closed source projects. The GPL, however, specifically states: "This General Public License does not permit incorporating your program into proprietary programs."

A third difference is that the GPL is a single, copyrighted (by the Free Software Foundation, Inc.) license with no variants. BSD-style licenses, in contrast, are commonly modified for the specific situation.

Copyright

Both the copyright of the NagiosQL program as well as the copyright for this website remains with the developers of this project, represented by Martin Willisegger.