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