Web site, people still go to local computer stores and buy copies of their

box set, which is simply a printed version of the manual (available under

a Free license as well) and the Free Software system it documents.

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are the most widely used models for GPL'd software. The GPL is

central to their success, because it ensures that the code base

remains common, and that large and small companies are on equal

footing for access to the technology. Consider, for example, the GNU

Compiler Collection (GCC). Cygnus Solutions, a company started in the

early 1990s, was able to grow steadily simply by providing services