Improved yasnippet to insert comment depending on the mode.

gpl.yasnippet

# -*- mode: snippet -*-
# name: gplc
# contributor: Vasudev Kamath <kamathvasudev@gmail.com>
# --
 ${1:`(buffer-name)`}
 
 Copyright ${2:`(nth 5 (decode-time))`} ${3:`(user-full-name)`} ${4:<`(replace-regexp-in-string "@" "@" user-mail-address)`>}
      
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU ${5:$$(yas/choose-value '("Lesser" "Affero" ""))} General Public License as published by
 the Free Software Foundation; either version ${6:3$$(yas/choose-value '("2" "2.1" "3"))} 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.
       
 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 MA 02110-1301, USA.
`(comment-region 1 (point))`