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武雄市図書館構想
における個人情報保護の
     問題点
  大雑把なまとめ
図書館が持っている情報
貸出先の住所,氏名など個人情報
 遅滞時の督促や破損時の損害請求等のため
 貸出先の特定のため
 予約時の予約者特定のため
図書館が破棄していた履歴
誰が,いつ,何を借りたかという情報
 返却後は使用しないため
 蓄積することで個人の思想等の記録となる
 ため
予約情報
 貸出後は使用しないため
 蓄積することで個人の思想等の記録となる
 ため
記者会見時の樋渡構想での問題
5/4 記者会見時の発言
 これ今まで、これは個人情報だって名の下
 にね、全部廃棄してたんですよ。何で本を
 借りるのが個人情報なんだと僕なんか思い
 ますので。
 僕はそれを元にしてリコメンドを出したい
 んですよ


破棄していた情報の内容は先述
Blog での訂正
僕が言っているのは、「5月6日20
時40分、42歳の市内在住の男性
が、「深夜特急」「下町ロケット」
「善の研究」」を借りた。」というこ
とそのものについては、個人が特定で
きないし、仮にこれが外部に出ても法
令に照らし、全く問題がない、これが
僕の見解であり、図書館の貸出履歴
は、これをもとに、個人情報に当たら
ないって言っているんです。個人が特
定できない。
訂正後の問題点
分単位までの時刻と年齢,性別がある
貸出履歴は貸出時に作成される
最新部分は現在の貸出内容である可能
性がある

データが結合できる可能性が高い
樋渡市長想定の匿名化




・住所:氏名         ・??:??
・年齢:性別   匿名化   ・年齢:性別
 ・貸出時刻          ・貸出時刻
・返却予定日          ・????
 ・貸出書籍          ・貸出書籍
匿名化を解除できる要件
最新の貸出履歴が貸出中なら・・・




・住所:氏名   判明    ・??:??
・年齢:性別    一致   ・年齢:性別
 ・貸出時刻    一致    ・貸出時刻
・返却予定日   判明     ・????
 ・貸出書籍    一致    ・貸出書籍
T ポイントカードの場合の問
題
  ポイント付与,使用のため ID が必須



T ポイントカード番号   一致   T ポイントカード番号
   ・住所:氏名     判明      ・??:??
   ・年齢:性別             ・年齢:性別
    ・貸出時刻              ・貸出時刻
   ・返却予定日     判明       ・????
    ・貸出書籍              ・貸出書籍
レコメンド用 DB を新設する
場合
  正しくはこうすべき



T ポイントカード番号 削除      ??????
   ・住所:氏名    削除     ・??:??
   ・年齢:性別  あいまい化   ・年齢層:性別
    ・貸出時刻  あいまい化     ・貸出時期
   ・返却予定日    削除      ・????
    ・貸出書籍  あいまい化     ・書籍分類
レコメンド用 DB なら匿名維持可
能
  あいまい化により最新情報と一致しない



T ポイントカード番号    ??????
   ・住所:氏名      ・??:??
   ・年齢:性別     ・年齢層:性別
    ・貸出時刻       ・貸出時期
   ・返却予定日       ・????
    ・貸出書籍       ・書籍分類
レコメンド用 DB によるレコ
メンド
DB の情報をもとにおすすめが出せる
が・・・

            ??????
            ・??:??
           ・年齢層:性別
過去に借りたこと     ・貸出時期
がある本かどうか     ・????
 判別できない      ・書籍分類
参考: Amazon のおすすめ
購入履歴をそのまま DB に持っている
検索結果等からの表示履歴も持ってい
る
「おすすめ商品」はそれらをもとに表
示

表示履歴の削除等が可能

完全に個人に紐づいている
結論
樋渡市長の言う図書館が破棄するデータは個
人情報に相当する
ブログで訂正された匿名化レコメンド用デー
タは個人情報に相当する場合がある
 そのような場合,個人情報として扱うのが普通
 通産省ガイドラインによる


レコメンドを正確に出すことと匿名化は並立
できない
 過去に借りたことのある本を排除する必要のため

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武雄市図書館構想