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Third party software components, notices
and OSS license texts
For example, if you distribute copies of the library, whether gratis or for a fee, you must give the recipients all the rights that
we gave you. You must make sure that they, too, receive or can get the source code. If you link a program with the library, you
must provide complete object files to the recipients so that they can relink them with the library, after making changes to the
library and recompiling it. And you must show them these terms so they know their rights.
Our method of protecting your rights has two steps: (1) copyright the library, and (2) offer you this license which gives you
legal permission to copy, distribute and/or modify the library.
Also, for each distributor's protection, we want to make certain that everyone understands that there is no warranty for this free
library. If the library is modified by someone else and passed on, we want its recipients to know that what they have is not the
original version, so that any problems introduced by others will not reflect on the original authors' reputations.
Finally, any free program is threatened constantly by software patents. We wish to avoid the danger that companies distrib-
uting free software will individually obtain patent licenses, thus in effect transforming the program into proprietary software.
To prevent this, we have made it clear that any patent must be licensed for everyone's free use or not licensed at all.
Most GNU software, including some libraries, is covered by the ordinary GNU General Public License, which was designed
for utility programs. This license, the GNU Library General Public License, applies to certain designated libraries. This license
is quite different from the ordinary one; be sure to read it in full, and don't assume that anything in it is the same as in the ordi-
nary license.
The reason we have a separate public license for some libraries is that they blur the distinction we usually make between modi-
fying or adding to a program and simply using it. Linking a program with a library, without changing the library, is in some
sense simply using the library, and is analogous to running a utility program or application program. However, in a textual and
legal sense, the linked executable is a combined work, a derivative of the original library, and the ordinary General Public
License treats it as such.
Because of this blurred distinction, using the ordinary General Public License for libraries did not effectively promote software
sharing, because most developers did not use the libraries. We concluded that weaker conditions might promote sharing better.
However, unrestricted linking of non-free programs would deprive the users of those programs of all benefit from the free
status of the libraries themselves. This Library General Public License is intended to permit developers of non-free programs to
use free libraries, while preserving your freedom as a user of such programs to change the free libraries that are incorporated in
them. (We have not seen how to achieve this as regards changes in header files, but we have achieved it as regards changes in
the actual functions of the Library.) The hope is that this will lead to faster development of free libraries.
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