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Ref: Free Cards from ALDIL www.aldil.org/les-activites/les-projets/ |
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The GPL (GNU General Public License) and the LGPL (GNU Lesser General Public License) guarantee the four fundamental liberties of software. They impose an important restriction : a software deriving from a software protected by such a licence should keep the same license (or a similar one).
The GPL imposes a supplementary restriction : a GPL software cannot be used within a non GPL compatible software.
The BSD (NetBSD, OpenBSD, FreeBSD, etc.) systems derive from the UNIX code of the Berkeley University. Unlike the GPL, these systems are diffused under a free license allowing the use of their code in any software (free or not).