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`Special' licences

It is also possible to sell `exceptions' to an open source licence for specific commercial applications. For example, SleepyCat software distributes the dbm database engine under the GPL, but can grant `exceptions' under an alternative licence which allows for integration into proprietary projects, which is impossible with the GPLed version (they also provide services as consultants on the same code).

Jesus M. Gonzalez-Barahona