User Manual

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The reason we have a separate public license for some libraries is that they blur the distinction

we usually make between modifying 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.

The precise terms and conditions for copying, distribution and modification follow. Pay close

attention to the difference between a "work based on the library" and a "work that uses the

library". The former contains code derived from the library, while the latter only works together

with the library.

Note that it is possible for a library to be covered by the ordinary General Public License rather

than by this special one.

TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

0. This License Agreement applies to any software library which contains a notice placed by the

Library General Public License (also called "this License"). Each licensee is addressed as "you".

A "library" means a collection of software functions and/or data prepared so as to be

conveniently linked with application programs (which use some of those functions and data) to

form executables.

The "Library", below, refers to any such software library or work which has been distributed

under these terms. A "work based on the Library" means either the Library or any derivative work

under copyright law: that is to say, a work containing the Library or a portion of it, either verbatim

or with modifications and/or translated straightforwardly into another language. (Hereinafter,

translation is included without limitation in the term "modification".)

"Source code" for a work means the preferred form of the work for making modifications to it.

For a library, complete source code means all the source code for all modules it contains, plus

any associated interface definition files, plus the scripts used to control compilation and

installation of the library.

Activities other than copying, distribution and modification are not covered by this License; they

are outside its scope. The act of running a program using the Library is not restricted, and output

from such a program is covered only if its contents constitute a work based on the Library

(independent of the use of the Library in a tool for writing it). Whether that is true depends on

what the Library does and what the program that uses the Library does.

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