Here is a well known example: the Web. The Web follows a client-server architecture, i.e., a Web client (Abrowser, Internet Explorer, etc.) queries Web pages to a Web server (Apache, Microsoft's Internet Information Services, etc.) that, well, serves them. As you see the client and the server are separate programs. They can either be free, i.e., grants the four fundamental freedoms to their respective users (the guy behind the Web client and the guy owning the Web server), or not. Above, the first examples (between parentheses) are free software; the second ones are proprietary software. If you are browsing the Web and value your freedoms, you will use a free Web client (e.g., Abrowser) but do not care about the free/proprietary nature of the Web servers you query. Indeed, those Web servers do not do your computing. They do the computing of their owners who should care about using a free Web sever (e.g., Apache).

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