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- From: tzs@carson.u.washington.edu (Tim Smith)
- Newsgroups: gnu.misc.discuss
- Subject: Re: Fund raising at the FSF
- Date: 8 Jan 1993 12:42:30 GMT
- Organization: University of Washington School of Law, Class of '95
- Lines: 68
- Message-ID: <1ijsrmINN8jr@shelley.u.washington.edu>
- References: <1993Jan7.112550.22626@uwasa.fi> <1iik7pINN4qf@shelley.u.washington.edu> <FRIEDMAN.93Jan8022706@nutrimat.gnu.ai.mit.edu>
- NNTP-Posting-Host: carson.u.washington.edu
-
- friedman@gnu.ai.mit.edu (Noah Friedman) writes:
- >>There is also the possibility that they would simply arrange things so that
- >>the source you get is not all you need. Suppose, for example, someone wanted
- >>to use GNU Emacs in a proprietary editor for Microsoft Windows. What would
- >>stop them from doing the following:
- >>
- >> 1. Find the places where they want to make proprietary changes to
- >> GNU Emacs.
- >>
- >> 2. Rewrite those parts so that they depend on a DLL (dynamic link
- >> library) to perform the functions that they want to do
- >> proprietarily (sp?).
- >>
- >> 3. Distribute the modified GNU Emacs under GPL.
- >>
- >> 4. Implement a proprietary DLL, which is not distributed under
- >> GPL.
- >>
- >>Is this a violation of GPL?
- >
- >Yes. The GPL says, in part:
- >
- > 2. You may modify your copy or copies of the Program or any portion
- > of it, thus forming a work based on the Program, and copy and
- > distribute such modifications or work under the terms of Section 1
- > above, provided that you also meet all of these conditions:
- >
- > ...
- >
- > b) You must cause any work that you distribute or publish, that in
- > whole or in part contains or is derived from the Program or any
- > part thereof, to be licensed as a whole at no charge to all third
- > parties under the terms of this License.
-
- Yes, but suppose they do distribute the modified Emacs with source, but
- not the DLL? The DLL does not contain any Emacs code, and is not part
- Emacs (see below for an explanation of what a DLL is -- I think many people
- might not know this).
-
- >First, a general one. If we permitted company A to make a propriatary
- >file, and company B to distribute GNU software linked with that file,
- >the effect would be to make a hole in the GPL big enough to drive a
- >truck through. This would be carte blanche for withholding the source
- >code for all sorts of modifications and extensions to GNU software.
- >
- >Giving all users access to the source code is one of our main
- >goals, so this consequence is definitely something to avoid.
- >
- >More directly, the versions of GNU software linked with proprietary
- >libraries would not really be free software as we intend the term--they
- >would not come with full source code that enables users to change and
- >recompile the program.
-
- The problem here is what does it mean to be linked? A DLL is not linked
- to a program in the traditional sense. A DLL is a separate file that
- exports entry points that the system binds dynamically to running programs.
- It can be shared among several programs, and the program does not have to
- be recompiled when the DLL changes. It is installed by basically just
- putting the file in a directory in your path.
-
- If the GPL does prevent someone from doing this with a DLL, then how are
- people able to distribute ports of Emacs for proprietary operating
- systems? If I modifiy GNU Emacs to work with my proprietary operating
- system, and am willing to distribute my changes to Emacs, this is OK, right?
- How is this different from modifying it to work with my proprietary
- Windows DLL, as long as I am willing to distribute the Emacs changes?
-
- --Tim Smith
-