[ruby-list:34798] Re: スクリプティング言語における GPL

Walrus, Ruby の場合にどうなるか僕は判断できませんが，参考までに...

From: "Akinori MUSHA" <[e-mail]>

> 　GPL という「宣言」を厳格に読むと、静的リンクだろうが動的リンク
> だろうが、スクリプト言語だろうがコンパイラ言語だろうが、(法的な
> 有効性は別として)
>
> 	実行時にリンクして使えば染まります
>
> という主張であるのは確かだと思います。

そう思います．

例えば，RMS の考えでは，

  Kaffe (GNU GPL な Java 仮想マシン + クラスライブラリ) 上で
  GNU GPL 非コンパチな Java プログラムを実行することはできない

らしいです．(添付メール参照)
キビシ〜！と思いました．

> 　私は、スクリプト言語で書かれたライブラリを require などして利用
> するのは動的リンク以外の何物でもないと思います。名前(シンボル)で
> 参照する(呼ぶ)という点で何ら変わりませんから。

Ruby の require が GNU GPL の言うリンクにあたるかどうかは，判りません．
あたりそうな気はしてます．

Kazuyuki Shudo/首藤一幸   私をたばねないで あらせいとうの花のように
  [e-mail]   http://www.shudo.net/
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From: "Etienne M. Gagnon" <[e-mail]>
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Subject: Re: Re (2): testing before a release
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Date: Fri, 16 Nov 2001 17:16:21 -0500
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Stuart Ballard wrote:

> It's possible to modify a GPL'd app to use a proprietary library, and
> run that, too, so long as you don't distribute the result (the fact that
> the modified app is a derived work is clearer in this case, too).
> 
> The GPL only kicks in for distribution. Period. If that's not the case,
> then I've been very much misled in every licensing discussion I've ever
> had, and by the GPL FAQ and other FSF documents on the GPL. And if
> that's true then someone ought to really raise a stink, because I doubt
> I'm the only one.


Here's an edited extract of an email between RMS and myself about the subject.

...
RMS: You're assuming that "making normal use" cannot be making a derived work.
   That assumption is not right, though.  Making normal use of a module
   CAN be making a derived work.  For example, for a library, normal use
   is ALWAYS making a derived work.

Etienne: So, what would be your answer to the question:
     "Can I run proprietary Java applications and native JNI libraries under
     Kaffe?"

RMS: My answer would be, no you can't.

Etienne: How come "running" a non-free Java program on Kaffe would violate
       the GPL license?  This is a point I have difficulty to understand.

RMS: Because it is linking the two together.
...
Etienne: Just to confirm that I now understand correctly...
   Linking (dynamic and/or static) of an GPL work "A" with another work "B"
   is addressed by clause 2 of the GPL, namely: "you may *modify* your
   copy...".  This is because linking "A" with "B" does *modify* "A".

   The analogy would be to say that "linking" a work by Shakespeare (which
   is in the public domain) with an "introduction and commentary" does
   create a derived work, even though no word has been changed in
   Shakespeare's text.  So, the simple act of "linking" constitutes a
   modification of the original work.  Right?

RMS: Right.  It makes a collective or combined work.

Now, you can ask RMS for clarifications, if you want.

Etienne
-- 
Etienne M. Gagnon                    http://www.info.uqam.ca/~egagnon/
SableVM:                                       http://www.sablevm.org/
SableCC:                                       http://www.sablecc.org/


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