[pp.int.general] purpose of manifesto

[Richard M Stallman]

    while pirates may be inclined to prefer the former, remember that open 
    source licences like gnu

If you're talking about the GNU General Public License, describing it
as an "open source" license will give people the wrong idea, since we
developed it to be a free software license.  If it qualifies as open
source that is only because the criterion of open source was derived
from that of free software.

See http://www.gnu.org/philosophy/open-source-misses-the-point.html for more
explanation of the difference between these two philosophical ideas,
free software and open source.