Qt becomes LGPL

Nokia has announced that the Qt library will, from the upcoming 4.5 release, be licensed under the LGPL 2.1 license in addition to the existing GPL and commercial licenses.

So what does it mean to developers?

Well, in the past you had two options when using Qt:

  • you used the freely available GPL version of Qt and made your application open source too, or
  • you purchased the commercial version of Qt and were free to keep your application closed source

The new LGPL license will enable closed source applications to use Qt libraries without having to purchase the commercial version of Qt.

Of course paying for Qt also provides many other benefits such as support.

Ultimately this change could see Qt being adopted by many more projects and maybe even becoming the de facto C++ core library.
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