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- Voddler's peer-to-peer based content distribution system, called VoddlerNet, incorporates code written by Google.
- The code they're using is Google's implementation of an elliptic curve ("curve25519") developed by Daniel J. Bernstein.
- The source code is available here: http://code.google.com/p/curve25519-donna/
- (Voddler uses this for fast Diffie-Hellman agreements between peers, needed to agree on a shared encryption key to encrypt traffic between peers.)
- The code implementing this elliptic curve is licensed under a 3-clause BSD license.
- This can be verified by downloading the archive and look at the file curve25519-donna.c.
- I've reproduced its header below.
- The second clause in the BSD license has the following requirement:
- * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- What this means in practice is that, if you distribute a program
- (e.g. VoddlerNet) that incorporates such code, you're required to
- reproduce the code's license somewhere.
- Most people do this by including a "CREDITS" or "COPYING" textfile
- where the license is reproduced.
- I've got Voddler (which VoddlerNet is part of) installed on my Mac
- but none of the files installed by Voddler reproduces the license
- for curve25519-donna.
- This violates the 3-clause BSD license under which Google's
- curve25519-donna implementation is distributed.
- Below is the full header from curve25519-donna.c:
- /* Copyright 2008, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * curve25519-donna: Curve25519 elliptic curve, public key function
- *
- * http://code.google.com/p/curve25519-donna/
- *
- * Adam Langley <agl@imperialviolet.org>
- *
- * Derived from public domain C code by Daniel J. Bernstein <djb@cr.yp.to>
- *
- * More information about curve25519 can be found here
- * http://cr.yp.to/ecdh.html
- *
- * djb's sample implementation of curve25519 is written in a special assembly
- * language called qhasm and uses the floating point registers.
- *
- * This is, almost, a clean room reimplementation from the curve25519 paper. It
- * uses many of the tricks described therein. Only the crecip function is taken
- * from the sample implementation.
- */
- Also see their violation of the Gnu GPL license:
- http://en.wikipedia.org/wiki/Voddler#Source_Code_Copyright_Violation_Concerns
- Basically, if you're distributing a program that incorporates GPL-licensed code,
- e.g. VoddlerPlayer.exe, all code needed to rebuild VoddlerPlayer.exe from scratch
- need to be provided in order to comply with the terms listed in GPL.
- Voddler so far have only provided the source code for XBMC (the GPL-licensed media
- center application Voddler is based on). This code by itself cannot be used to
- rebuild VoddlerPlayer.exe and they are thus in violation of GPL.
- Several people have complained here:
- http://getsatisfaction.com/voddler/topics/gpl_and_voddlerplayer_exe
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