| eSvn License for Unix platforms: | | This program is free software; you can redistribute it and/or modify | it under the terms of the GNU General Public License as published by | the Free Software Foundation; either version 2 of the License, or | (at your option) any later version. This program is distributed in | the hope that it will be useful, but WITHOUT ANY WARRANTY; without | even the implied warranty of MERCHANTABILITY or FITNESS FOR A | PARTICULAR PURPOSE. | | See the GNU General Public License for more details.
This is almost free, but it doesn't permit porting to non-Unix platforms under a free license (which clearly restricts modification). It seems that this isn't merely an accident. From the non-free non-UNIX license: | 4. The source code is the creative property of the authors. | Extensions and development under the terms of the Gnu Public License | are limited to the Unix platform. Any distribution or compilation of | the source code against libraries licensed other than gpl requires | the written permission of the authors. This is a bit similar to the non-free Motif license that was restricted to open-source operating systems. It looks as if the authors want to prevent others from releasing a version for a certain proprietary operating system.