"With the introduction of the GNU GPLv3, the GNU Lesser General
Public License (L-GPL) has seen much less attention. This has
changed with the recent GPLv3 conference in Barcelona, and I think
it has changed for the better.
"Historically, the GNU L-GPL has been drawn from language
similar to, but not identical with, the GNU GPL. It is a license
that can be reverted to the GNU GPL, and given the subtle
differences, it may be best thought of as a disjunctive license.
Often it has been used for C coded libraries, and so has often been
mistakenly called the 'Library' GPL. This is an error and confuses
the original purpose of the GNU Lesser GPL..."