* altcanna, jinmei, skk: GPL
* hatena: [free for personal use](http://developer.hatena.ne.jp/ja/documents/keyword/misc/catalog)
* edict: [CC-BY-SA 3.0](http://www.edrdg.org/edrdg/licence.html)
* ekimei: [CC-BY-SA 3.0](https://ja.wikipedia.org/wiki/Wikipedia:ウィキペディアを二次利用する)
* zip code: [public domain](http://www.post.japanpost.jp/zipcode/dl/readme.html)
* Japanese WordNet: http://nlpwww.nict.go.jp/wn-ja/license.txt
* niconico: unknown
* my ruby/shell scripts: GPL
