If the GPL were not so tight on this point, someone could
commercialize a GUI for R without having to offer their source code
under the GPL.
There is nothing in GPL to stop a commercial GUI for R. Have a look at
what Apple do. They have a complete commercial GUI and numerous
applications built on a an almost completely GPL'ed operating system.
There are loads of shareware GUIs which drive GPL utilities. Most
obviously there are plenty of commercial apps which run on GNU Linux.
Bill Northcott
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