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Since Linux may be freely copied, it's difficult to know exactly how many Linux users there are. Possible ways of estimating the number of Linux users include counting the number of official distributions sold, and surveying the readers of computing magazines. Another way is to ask users to register their use of Linux with a central site. For Linux, the central site is the Linux Counter.
A more direct advantage of registering your Linux use is that you get a pretty user certificate such as the one shown.
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Linux Registration
There's no fee for registering your usage, and
it's not compulsory, but doing so increases the visible use of Linux, and encourages more
applications to be written for or ported to Linux. 
Linux®
is a registered trademark of Linus Torvalds.