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Preamble to the Gnu Lesser General Public License
Copyright (c) 2016 Franz Inc., Berkeley, CA 94704
The concept of the GNU Lesser General Public License version 2.1 ("LGPL")
has been adopted to govern the use and distribution of above-mentioned
application. However, the LGPL uses terminology that is more appropriate
for a program written in C than one written in Lisp. Nevertheless, the
LGPL can still be applied to a Lisp program if certain clarifications
are made. This document details those clarifications. Accordingly, the
license for the open-source Lisp applications consists of this document
plus the LGPL. Wherever there is a conflict between this document and
the LGPL, this document takes precedence over the LGPL.
A "Library" in Lisp is a collection of Lisp functions, data and foreign
modules. The form of the Library can be Lisp source code (for processing
by an interpreter) or object code (usually the result of compilation of
source code or built with some other mechanisms). Foreign modules are
object code in a form that can be linked into a Lisp executable. When
we speak of functions we do so in the most general way to include, in
addition, methods and unnamed functions. Lisp "data" is also a general
term that includes the data structures resulting from defining Lisp
classes. A Lisp application may include the same set of Lisp objects
as does a Library, but this does not mean that the application is
necessarily a "work based on the Library" it contains.
The Library consists of everything in the distribution file set before
any modifications are made to the files. If any of the functions or
classes in the Library are redefined in other files, then those
redefinitions ARE considered a work based on the Library. If additional
methods are added to generic functions in the Library, those additional
methods are NOT considered a work based on the Library. If Library classes
are subclassed, these subclasses are NOT considered a work based on the Library.
If the Library is modified to explicitly call other functions that are neither
part of Lisp itself nor an available add-on module to Lisp, then the functions
called by the modified Library ARE considered a work based on the Library.
The goal is to ensure that the Library will compile and run without getting
undefined function errors.
It is permitted to add proprietary source code to the Library, but it must
be done in a way such that the Library will still run without that proprietary
code present. Section 5 of the LGPL distinguishes between the case of a
library being dynamically linked at runtime and one being statically linked
at build time. Section 5 of the LGPL states that the former results in an
executable that is a "work that uses the Library." Section 5 of the LGPL
states that the latter results in one that is a "derivative of the Library",
which is therefore covered by the LGPL. Since Lisp only offers one choice,
which is to link the Library into an executable at build time, we declare that,
for the purpose applying the LGPL to the Library, an executable that results
from linking a "work that uses the Library" with the Library is considered a
"work that uses the Library" and is therefore NOT covered by the LGPL.
Because of this declaration, section 6 of LGPL is not applicable to the Library.
However, in connection with each distribution of this executable, you must also
deliver, in accordance with the terms and conditions of the LGPL, the source code
of Library (or your derivative thereof) that is incorporated into this executable.