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[debian-devel:12052] Re: gs-aladdin license and GPL

佐野＠浜松です。

In article <20000406113341.31330.qmail@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,
  at "Thu, 6 Apr 2000 20:31:29 +0900',
   with "[debian-devel:12042] Re: gs-aladdin license and GPL",
 nakahara@xxxxxxxxxxxxxxxxxxxxx さん writes:

> 中原です。
> 
> 一点だけ。
(...)
> VFlib の利用の仕方が不明なので関係ないかもしれませんが、現在の VFlib 
> はライブラリ部分は debian 化にあたり、LGPL に変更してもらっています。

あ、そうなんですか。どうもです。

 /usr/share/doc/vflib2/copyright は見ていたのですが、

* The VFlib library is distributed under the terms of GNU Library General 
  Public License.
* Programs and documents and any other files (except those with explicit
  description) ares distributed under the terms of GNU General Public 
  License.

でしたね。"Library" の部分を見逃してました。

 LGPL-2.1 では

  5. A program that contains no derivative of any portion of the
Library, but is designed to work with the Library by being compiled or
linked with it, is called a "work that uses the Library".  Such a
work, in isolation, is not a derivative work of the Library, and
therefore falls outside the scope of this License.

  However, linking a "work that uses the Library" with the Library
creates an executable that is a derivative of the Library (because it
contains portions of the Library), rather than a "work that uses the
library".  The executable is therefore covered by this License.
Section 6 states terms for distribution of such executables.

  When a "work that uses the Library" uses material from a header file
that is part of the Library, the object code for the work may be a
derivative work of the Library even though the source code is not.
Whether this is true is especially significant if the work can be
linked without the Library, or if the work is itself a library.  The
threshold for this to be true is not precisely defined by law.

  If such an object file uses only numerical parameters, data
structure layouts and accessors, and small macros and small inline
functions (ten lines or less in length), then the use of the object
file is unrestricted, regardless of whether it is legally a derivative
work.  (Executables containing this object code plus portions of the
Library will still fall under Section 6.)

  Otherwise, if the work is a derivative of the Library, you may
distribute the object code for the work under the terms of Section 6.
Any executables containing that work also fall under Section 6,
whether or not they are linked directly with the Library itself.

とありますね。

 gs の VFlib 対応部分のコードは zkfvflib.c かな。

kfvflib.txt には

  このパッケージには以下のファイルが含まれています。

 kfvflib.sj  このファイル(Shift JIS)
 zkfvflib.c  ソースファイル
 kfvflib.mak Makefile
 kfvflib.ps  初期化用PostScriptファイル
 vflib.ps    ユーザ設定用PostScriptファイル

とあります。ソースコードは zkfvflib.c だけのようですね。

このファイルの最初のほうは

/*
 * zkfvflib.c --- Kanji font operator for VFlib.
 * Copyright (C) ASAYAMA Kazunori  1994.
 * Akira Tanaka <akr@xxxxxxxxxxx> modified for gs4.03/VFlib support. 1996/10/17
 * Akira Tanaka <akr@xxxxxxxxxxx> modified for gs5.10-vflib-1.3. 1998/05/12
 * Akira Tanaka <akr@xxxxxxxxxxx> modified for gs5.10-vflib-1.4. 1998/05/12
 */

#include "ghost.h"
#include "oper.h"
#include "gspath.h"
#include "gsmatrix.h"
#include "gscoord.h"
#include "igstate.h"
#include "gxcindex.h"

#include "gsuid.h"
#include "gxxfont.h"
#include "kfutil.h"
#include "gxxfvf.h"

となっていて、VF.h は include されていないので

  When a "work that uses the Library" uses material from a header file
that is part of the Library, the object code for the work may be a
derivative work of the Library even though the source code is not.
Whether this is true is especially significant if the work can be
linked without the Library, or if the work is itself a library.  The
threshold for this to be true is not precisely defined by law.

この部分は適用されないだろうと思います。でも

  However, linking a "work that uses the Library" with the Library
creates an executable that is a derivative of the Library (because it
contains portions of the Library), rather than a "work that uses the
library".  The executable is therefore covered by this License.
Section 6 states terms for distribution of such executables.

こっちのほうはどうなのかな。dynamic link でも適用されるのかどうか。

このへんの解釈次第では VFlib 対応の部分も「オリジナルの作者である
浅山さんの意向次第」といえるかもしれません。継続してメンテされて
いる田中さんは「任意の利用を許可します」とドキュメントに記載されて
いるので、オリジナルの浅山さんの意向が確認できれば OK だと思います。

-- 
     ＃ (わたしのおうちは浜松市、「夜のお菓子」で有名さ。)
    <kgh12351@xxxxxxxxxxx> : Taketoshi Sano (佐野　武俊)