Bjorn Reese helped me update the license section

Updated: August 17, 2000 (http://curl.haxx.se/docs/faq.shtml)

Updated: August 22, 2000 (http://curl.haxx.se/docs/faq.shtml)

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 6. License Issues

  6.1 I have a GPL program, can I use the libcurl library?

  6.2 I have a closed-source program, can I use the libcurl library?

  6.3 I have a program that uses LGPL libraries, can I use libcurl?

  6.4 Can I modify curl/libcurl for my program and keep the changes secret?

  6.5 Can you please change the curl/libcurl license to XXXX?

  6.3 I have a BSD licensed program, can I use the libcurl library?

  6.4 I have a program that uses LGPL libraries, can I use libcurl?

  6.5 Can I modify curl/libcurl for my program and keep the changes secret?

  6.6 Can you please change the curl/libcurl license to XXXX?

==============================================================================

  Curl is not a PHP tool, even though it works perfectly well when used from

  or with PHP.

  Curl is not a single-OS program. Curl exists, compiles, builds and runs

  under a long range of operating systems, including all modern Unixes,

  Windows, Amiga, BeOS, OS/2, OS X, QNX etc.

  1.4 When will you make curl do XXXX ?

  I love suggestions of what to change in order to make curl and libcurl

  Curl and libcurl are released under the MPL, the Mozilla Public License. To

  get a really good answer to this or other licensing questions, you should

  study the MPL license and the license you are about to use and check for

  clashes yourself. This is a brief summary for a few cases for which we get

  questions:

  clashes yourself. This is a brief summary for the cases we get the most

  questions. (Parts of this section was enhanced by Bjorn Reese.)

  6.1. I have a GPL program, can I use the libcurl library?

    No, you can't distribute your program as a binary and you cannot

    distribute the (lib)curl code with your code. GPL'd software requires all

    parts of the final executable to be licensed under GPL or a license that

    "does impose further restrictions". (One could argue about which license

    that acutally imposes the restrictions, but that'll be left for you to

    ponder about.) MPL is not compatible with GPL.

  No, unfortunately you cannot distribute the (lib)curl code with your code.

  According to both the Free Software Foundation and the Mozilla

  Organization, MPL and GPL are not compatible, because GPL requires of

  other licenses that they do "not impose any further restrictions on the

  recipients' exercise of the rights granted herein" [GPL paragraph 6] (One

  could argue about which license that actually imposes restrictions, but

  that'll be left for you to ponder about.)

  However, you have two alternative options:

    1) Nothing prevents you from distributing your program separately from

       curl and libcurl, and request that the user receives it separately.

       The incompability issues between MPL and GPL only applies to the

       distribution.

    2) Add the following exception to your distribution (you must have the

       consent of all the copyright holders of the source code in your

       project in order to do this) 

         As a special exception, you have permission to link this program

         with the curl library and distribute executables, as long as you

         follow the requirements of the GNU GPL in regard to all of the

         software in the executable aside from curl.

    However, nothing prevents you from distributing your program separately

    from curl and libcurl and request that the user gets it separately.

       This exception must be added to your GPL covered source code files

       immediately after the notification mentioned in the appendix of GPL.

       The wording was originally suggested by the Free Software Foundation

       in relationship with the Qt library. We have changed the wording to

       apply to curl.

  6.2. I have a closed-source program, can I use the libcurl library?

    library. If you end up doing changes to the library, only those changes

    must be made available, not the ones to your program.

  6.3. I have a program that uses LGPL libraries, can I use libcurl?

  6.3. I have a BSD licensed program, can I use the libcurl library?

    Yes, libcurl does not put any restrictions on the program that uses the

    library. If you end up doing changes to the library, only those changes

    must be made available, not the ones to your program.

  6.4. I have a program that uses LGPL libraries, can I use libcurl?

    Yes you can. LGPL libraries don't spread to other libraries the same way

    GPL ones do.

    However, when you read paragraph (3) of the LGPL license, you'll see that

    anyone - at will - may at any time convert that LGPL program into GPL. And

    GPL programs can't be distributed together, neither with (lib)curl source

    code and not as a binary.

    GPL programs can't be distributed together with MPL programs, neither with

    (lib)curl source code and not as a binary.

  6.4. Can I modify curl/libcurl for my program and keep the changes secret?

  6.5. Can I modify curl/libcurl for my program and keep the changes secret?

    No, you're not allowed to do that.

  6.5. Can you please change the curl/libcurl license to XXXX?

  6.6. Can you please change the curl/libcurl license to XXXX?

    No. We carefully picked this license years ago and a large amount of

    people have contributed with source code knowing that this is the license