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How does the GPL affect me?
In simple terms, the General Public Licence (GPL) provides you with the right to personal use of the open source but requires you to make your own work available under the GPL if you distribute it.
The following simplified interpretation may help answer the most common questions though there may be variations depending on the exact circumstances. The GPL itself should be used as the legal definition of what is allowed.
I want to use the GPL OpenQM for my own private, non-commercial developments.
This is exactly what the GPL is for. You are free to use the open source software in any way you wish in a non-commercial environment so long as you do not distribute it to others.
I want to use the GPL OpenQM in my business but will not sell any part of the application elsewhere.
This is also fine so long as all the development is done by you but remember that open source products come with no warranty or support. Use of external developers counts as distribution and this would require that your own developments are also released under the terms of the GPL.
I want to use the GPL OpenQM to develop an application that I will sell or give away to others to run on the GPL OpenQM.
You may do the development work using the GPL version. When you come to distribute the product, you must release your own software under the terms of the GPL. The end user is also bound by the terms of the GPL.
I want to use the GPL OpenQM to develop an application that I will
distribute to others to run on the commercial OpenQM.