It was downloaded from http://sourceforge.net/projects/tdiary/.

Upstream Authors:

filter/rblcheck.rb
  Copyright (c) 2004 MoonWolf <moonwolf@moonwolf.com>
  License: GPL

io/dbi_io
  Copyright (C) 2003 ma2tak <ma2tak@ma2tak.dyndns.org>
            (C) 2004 moonwolf <moonwolf@mooonwolf.com>
            (C) 2005 Kazuhiko <kazuhiko@fdiary.net>
            (C) 2007 sasasin <sasasin@sasasin.net>
  License: GPL

plugin/add_bookmark
  Copyright (c) 2005 SHIBATA Hiroshi <h-sbt@nifty.com>
  License: GPL

plugin/antirefspam
  Copyright (c) 2004-2005 T.Shimomura <redbug@netlife.gr.jp>
  License: GPL2

plugin/cocomment
  Copyright (C) 2006 by Hiroshi SHIBATA
  License: GPL2
  
plugin/google/google_adsense
  Copyright (C) 2004 Kazuhiko <kazuhiko@fdiary.net>
  License: GPL2

plugin/google/google_analytics
  Copyright (C) 2005 TADA Tadashi <sho@spc.gr.jp>
  License: GPL2

plugin/google/google_video
  Copyright (C) 2007 by KAKUTANI Shintaro <shintaro@kakutani.com>
  License: GPL2

plugin/hatena/hatena_star
  Copyright (C) Itoshi Nikaido <dritoshi at gmail dot com>
  Distributed under the GPL

plugin/iddy
  Copyright (C) 2007 by TADA Tadashi <sho@spc.gr.jp>
  License: GPL
  
plugin/image_ex
  Copyright (c) 2002 Daisuke Kato <dai@kato-agri.com>
  Copyright (c) 2002 Toshi Okada <toshi@neverland.to>
  Copyright (c) 2003 Yoshimi KURUMA <yoshimik@iris.dti.ne.jp>
  License: GPL2

plugin/image_gps
  Copyright (c) 2004,2005 kp <kp@mmho.no-ip.org>
  License: GPL

plugin/japanese/jdate
  Copyright (c) 2003 TADA Tadashi <sho@spc.gr.jp>
  License: GPL

plugin/japanese/jmonth.rb
  Copyright (c) 2005 sasasin/SuzukiShinnosuke<sasasin@sasasin.sytes.net>
  License: GPL

plugin/japanese/jroku.rb
  Copyright (c) 2005 SHIBATA Hiroshi <h-sbt@nifty.com>
  License: GPL

plugin/japanese/jyear.rb
  Copyright (c) 2005 sasasin/SuzukiShinnosuke<sasasin@sasasin.sytes.net>
  License: GPL

plugin/livedoor
  Copyright (C) 2007 SHIBATA Hiroshi <h-sbt@nifty.com>
  License: GPL2

plugin/opensearch_ad
  Copyright (c) 2006 SHIBATA Hiroshi <h-sbt@nifty.com>
  License: GPL

plugin/section_footer
  Copyright (c) 2005 SHIBATA Hiroshi <h-sbt@nifty.com>
  License: GPL2
  
plugin/select_theme
  Copyright (C) 2005  akira yamada
  License: GPL2

plugin/twitter[
  Copyright (C) 2007 Michitaka Ohno <elpeo@mars.dti.ne.jp>
  License: GPL2

plugin/youtube
  Copyright (C) 2007 by TADA Tadashi <sho@spc.gr.jp>
  License: GPL2
  
style/hatena
  Copyright(c) 2004 URABE, Shyouhei.
  Licnese:
  Permission is hereby granted, free of  charge, to any person obtaining a copy
  of  this code, to  deal in  the code  without restriction,  including without
  limitation  the rights  to  use, copy,  modify,  merge, publish,  distribute,
  sublicense, and/or sell copies of the code, and to permit persons to whom the
  code 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 code.
 
  THE  CODE 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
  AUTHOR  OR  COPYRIGHT  HOLDER 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 CODE OR THE  USE OR OTHER  DEALINGS IN THE
  CODE.

style/markdown
  Copyright (C) 2003, TADA Tadashi <sho@spc.gr.jp>
  Copyright (C) 2004, MoonWolf <moonwolf@moonwolf.com>
  License: GPL
  
util/clean-spam
  Copyright (C) 2004 Satoru Takabayashi <satoru@namazu.org>
  License: GPL2

util/estraier-search
  Copyright (C) 2007 Kazuhiko <kazuhiko@fdiary.net>
  License: GPL2

util/posttdiary
  Copyright (C) 2002, All right reserved by TADA Tadashi <sho@spc.gr.jp>
  License: GPL2
  
util/rast-search
  Copyright (C) 2005 Kazuhiko <kazuhiko@fdiary.net>
  License: GPL2

util/tdiary-vim
  Author: UECHI Yasumasa <uechi@.potaway.net>
  Copyright (C) 2004 UECHI Yasumasa
  License: GPL version 2 or later

util/tdiarysearch/search.rb
  Copyright (C) 2003,2004 Minero Aoki
  License: GPL version 2


GPL is written in /usr/share/common-licenses/GPL.