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What is Copyleft?
Copyleft is a general method for making a
software program or other work (like this website) free, and requiring all
modified and extended versions of the program to be
free as well.
This means that you can use any material on this
website to your hearts content. The main condition on
its use is that you may not sell it, or any variation
of it. And you must apply this Copyleft condition to
any work that you publish that uses any of this work.
So must any further users of the work.
In this way, it always remains free.
For more info on this philosophy visit
http://www.gnu.org/copyleft/copyleft.html#TOCWhatIsCopyleft
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