Update copyright

debian/copyright

@@ -6,9 +6,14 @@ Files: *
 Copyright: 2010-2015 Petr Vanek <petr@scribus.info>
 License: GPL-2+
 
+Files: src/third-party/*
+Copyright: Copyright (c) 2006 - 2011, the LibQxt project.
+License: BSD-3-clause
+
 Files: debian/*
 Copyright: 2012-2015 Alf Gaida <agaida@siduction.org>
            2012      Torsten Wohlfarth <towo@siduction.org>
+           2015      ChangZhuo Chen (陳昌倬) <czchen@gmail.com>
 License: GPL-2+
 
 License: GPL-2+
@@ -28,3 +33,30 @@ License: GPL-2+
  On Debian systems, the complete text of the GNU General
  Public License version 2 can be found in "/usr/share/common-licenses/GPL-2".
 
+License: BSD-3-clause
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions
+ are met:
+ .
+     1. Redistributions of source code must retain the above copyright
+        notice, this list of conditions and the following disclaimer.
+ .
+     2. 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.
+ .
+     3. Neither the name of the University 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 REGENTS 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 REGENTS 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.