In other cases, permission to use a particular library in non-free programs enables a greater number of people to use a large body of free software.[This is the first released version of the Lesser GPL.It also counts as the successor of the GNU Library Public License, version 2, hence the version number 2.1.] The licenses for most software are designed to take away your freedom to share and change it.And you must show them these terms so they know their rights.
We protect your rights with a two-step method: (1) we copyright the library, and (2) we offer you this license, which gives you legal permission to copy, distribute and/or modify the library.
You must make sure that they, too, receive or can get the source code.