LGPL
LGPL stands for The Gnu Lesser Public License
The GNU Lesser General Public License is a software license designed as a compromise between the GNU General Public License and the simple permissive licenses of X Window System and BSD. It places a copyleft restriction on individual source code files but does not copyleft the program as a whole.
The license is useful for software libraries; it was once called the GNU Library General Public License. The name change is likely more related to the FSF's propaganda aims than a concern for generality in projects that aren't libraries.
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