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Lisp Lesser GNU General Public License

1 http://opensource.franz.com/preamble.html
3 Preamble to the Gnu Lesser General Public License
5 Copyright (c) 2000 Franz Incorporated, Berkeley, CA 94704
7 The concept of the GNU Lesser General Public License version 2.1
8 ("LGPL") has been adopted to govern the use and distribution of
9 above-mentioned application. However, the LGPL uses terminology that
10 is more appropriate for a program written in C than one written in
11 Lisp. Nevertheless, the LGPL can still be applied to a Lisp program if
12 certain clarifications are made. This document details those
13 clarifications. Accordingly, the license for the open-source Lisp
14 applications consists of this document plus the LGPL. Wherever there
15 is a conflict between this document and the LGPL, this document takes
16 precedence over the LGPL.
18 A "Library" in Lisp is a collection of Lisp functions, data and
19 foreign modules. The form of the Library can be Lisp source code (for
20 processing by an interpreter) or object code (usually the result of
21 compilation of source code or built with some other
22 mechanisms). Foreign modules are object code in a form that can be
23 linked into a Lisp executable. When we speak of functions we do so in
24 the most general way to include, in addition, methods and unnamed
25 functions. Lisp "data" is also a general term that includes the data
26 structures resulting from defining Lisp classes. A Lisp application
27 may include the same set of Lisp objects as does a Library, but this
28 does not mean that the application is necessarily a "work based on the
29 Library" it contains.
31 The Library consists of everything in the distribution file set before
32 any modifications are made to the files. If any of the functions or
33 classes in the Library are redefined in other files, then those
34 redefinitions ARE considered a work based on the Library. If
35 additional methods are added to generic functions in the Library,
36 those additional methods are NOT considered a work based on the
37 Library. If Library classes are subclassed, these subclasses are NOT
38 considered a work based on the Library. If the Library is modified to
39 explicitly call other functions that are neither part of Lisp itself
40 nor an available add-on module to Lisp, then the functions called by
41 the modified Library ARE considered a work based on the Library. The
42 goal is to ensure that the Library will compile and run without
43 getting undefined function errors.
45 It is permitted to add proprietary source code to the Library, but it
46 must be done in a way such that the Library will still run without
47 that proprietary code present. Section 5 of the LGPL distinguishes
48 between the case of a library being dynamically linked at runtime and
49 one being statically linked at build time. Section 5 of the LGPL
50 states that the former results in an executable that is a "work that
51 uses the Library." Section 5 of the LGPL states that the latter
52 results in one that is a "derivative of the Library", which is
53 therefore covered by the LGPL. Since Lisp only offers one choice,
54 which is to link the Library into an executable at build time, we
55 declare that, for the purpose applying the LGPL to the Library, an
56 executable that results from linking a "work that uses the Library"
57 with the Library is considered a "work that uses the Library" and is
58 therefore NOT covered by the LGPL.
60 Because of this declaration, section 6 of LGPL is not applicable to
61 the Library. However, in connection with each distribution of this
62 executable, you must also deliver, in accordance with the terms and
63 conditions of the LGPL, the source code of Library (or your derivative
64 thereof) that is incorporated into this executable.
66 End of Document

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