license.txt

用mega8模拟usb做下载线（AVR）

PREFACE

Conceiving and understanding a new license is not an easy task. To make things
easier for both, the author and the licensee, we have decided to base our
license for the USB driver on an existing license with well-understood
properties.

Our favorite choice for the base license was the GNU General Public License
(GPL). However, we cannot use the GNU GPL directly for the following reasons:

(1) It was not intended for projects involving hardware -- we must extend the
    term "source code" to at least the circuit diagram.
(2) The GNU GPL does not require publication. Only if a binary is published,
    it requires that the source is published as well. This is reasonable for
    software because unpublished software is of little relevance. For projects
    involving hardware, we want to REQUIRE publication. More than that, we
    even want to define HOW the publication must be done (files contained,
    file formats etc).
(3) As the author of the software, we can distribute it under more than one
    license. For people who don't want to meet the obligations of the GNU GPL,
    we want to offer pay-by-unit business licenses. To avoid a split in
    revisions of the driver, we need special privileges to distribute
    contributed modifications under other licenses.

We can not simply modify the GNU GPL and incorporate our changes because the
Free Software Foundation (FSF) who holds the copyright for the text of the
GNU GPL does not allow modifications. We therefore set up our own small
license which incorporates the GNU GPL by reference:



LICENSE FOR PROJECTS BUILT WITH "OBJECTIVE DEVELOPMENT'S
FIRMWARE-ONLY USB-DRIVER FOR ATMEL'S AVR MICROCONTROLLERS"
Version 2005-02


I. Definitions

"OBDEV" shall mean OBJECTIVE DEVELOPMENT Software GmbH or any legal successor
thereof.

"Software Source Code" shall mean the preferred form of the software for
making modifications to it.

"USB Driver" shall mean the Software Source Code for OBDEV's firmware-only
USB-driver for Atmel's AVR microcontrollers.

"Function" shall mean the Software Source Code for all software executed on
the microcontroller except the USB Driver.

"Host Software" shall mean the Software Source Code for all software required
to control the USB device from the USB host running any operating system.

"Project" shall mean the USB Driver, the Function, the Host Software, circuit
diagrams of the controller based hardware and accompanying documentation.

"source code" shall have the same meaning as the term "Project" above.

"Web Site" shall mean a collection of text and multimedia documents accessible
worldwide over internet through the HyperText Transfer Protocol (HTTP) on
TCP port 80 (standard HTTP port).


II. General License Terms
The general terms of this license consist of the GNU General Public License
Version 2 (GNU GPL2) which is hereby incorporated into this section as though
it were fully set forth here. A copy of the GNU GPL2 is included for your
convenience in appendix A of this license.

The term "source code" in the GNU GPL2 is to be understood as defined in
section I above. If any term or definition in section I, III, IV or V
conflicts with the GNU GPL2, the term or definition in section I, III, IV or
V has precedence of the GNU GPL2.


III. Distribution of the Project
The distributed form of a Project must contain at least the following files:
(a) Software Source Code files for the USB Driver, the Function and the Host
    Software.
(b) Circuit diagrams for the hardware in PDF, PNG or GIF image file format.
(c) A file with name "Readme.txt" in ASCII format with at least the following
    content (in English language):
    - An explanation what the Project does.
    - What to do with the distributed files (installation procedure etc.).
    - A reference to Objective Development's USB driver.
    - Your (author's) name and contact information. E-mail and/or URL is
      sufficient.
(d) Optionally a text file with a description of the circuit diagram, an
    explanation of special (software) techniques used etc. 
(e) A copy of this license in a file with the name "License.txt".


IV. Requirement for Publication
All modifications and derived work (Projects using the USB Driver) MUST be
distributed (published) as described in section III above on a Web Site. The
main page must reproduce at least a description of the Project (e.g. as
contained in the "Readme.txt" file distributed) and a download link for the
entire Project. The URL of the main page must be submitted to OBDEV. OBDEV
will provide a mechanism for submitting Project URLs and for publishing
Projects on their Web Site. The Project must remain available for at least
twelve (12) months after the initial publication or at least six (6) months
after a subsequent version of that particular Project has been published.


V. Author Privileges
OBDEV reserves the right to distribute the USB Driver and all modified
versions under other (proprietary) licenses. If you modify the USB Driver
under the grants of this license, you therefore grant OBDEV (in addition to
the grants of the GNU GPL2) a worldwide, perpetual, irrevocable royalty free
license for your modifications. OBDEV shall not automatically gain rights
other than those of the GNU GPL2 in the other parts of the Project. This
section V overrides possibly contradicting terms in the GNU GPL2 referenced
in section II.


APPENDIX A

		    GNU GENERAL PUBLIC LICENSE
		       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

			    Preamble

  The licenses for most software are designed to take away your
freedom to share and change it.  By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users.  This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it.  (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.)  You can apply it to
your programs, too.

  When we speak of free software, we are referring to freedom, not
price.  Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.

  To protect your rights, we need to make restrictions that forbid
anyone to deny you these rights or to ask you to surrender the rights.
These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.

  For example, if you distribute copies of such a program, whether
gratis or for a fee, you must give the recipients all the rights that
you have.  You must make sure that they, too, receive or can get the
source code.  And you must show them these terms so they know their
rights.

  We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
distribute and/or modify the software.

  Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software.  If the software is modified by someone else and passed on, we
want its recipients to know that what they have is not the original, so
that any problems introduced by others will not reflect on the original
authors' reputations.

  Finally, any free program is threatened constantly by software
patents.  We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary.  To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.

  The precise terms and conditions for copying, distribution and
modification follow.

		    GNU GENERAL PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License.  The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language.  (Hereinafter, translation is included without limitation in
the term "modification".)  Each licensee is addressed as "you".

Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope.  The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.

  1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.

You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.

  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:

    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.

    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.

    c) If the modified program normally reads commands interactively
    when run, you must cause it, when started running for such
    interactive use in the most ordinary way, to print or display an
    announcement including an appropriate copyright notice and a
    notice that there is no warranty (or else, saying that you provide
    a warranty) and that users may redistribute the program under
    these conditions, and telling the user how to view a copy of this
    License.  (Exception: if the Program itself is interactive but
    does not normally print such an announcement, your work based on
    the Program is not required to print an announcement.)