COPYING.txt

                  GNU LESSER GENERAL PUBLIC LICENSE
                       Version 2.1, February 1999

 Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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[This is the first released version of the Lesser GPL.  It also counts
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 the version number 2.1.]

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           How to Apply These Terms to Your New Libraries

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Also add information on how to contact you by electronic and paper
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You should also get your employer (if you work as a programmer) or
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  Yoyodyne, Inc., hereby disclaims all copyright interest in the
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  <signature of Ty Coon>, 1 April 1990
  Ty Coon, President of Vice

That's all there is to it!