Copyright for debianbuttons source package in Wheezy

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Debian buttons
Source: 

Files: *
Copyright: 2009, 2010, 2011, 2012 Damyan Ivanov 
License: X11

Files: res/button-bts.xcf chrome/content/*.png
Copyright: 1999 Software in the Public Interest
 2009, 2010, 2011, 2012 Damyan Ivanov 
License: X11

Files: debian/*
Copyright: 2012 Tanguy Ortolo 
License: X11

License: X11
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the "Software"),
 to deal in the Software without restriction, including without limitation
 the rights to use, copy, modify, merge, publish, distribute, sublicense,
 and/or sell copies of the Software, and to permit persons to whom the
 Software is furnished to do so, subject to the following conditions:
 .
 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.
 .
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.