1. Public Suffix List
http://publicsuffix.org/ http/cookieの適用範囲
A "public suffix" is one under which Internet users can directly register names.
It allows browsers to, for example:
- Avoid privacy-damaging "supercookies" being set for high-level domain name suffixes
- Highlight the most important part of a domain name in the user interface
- Accurately sort history entries by site
2011年9月29日現在のリストからjp関連を抜き出したものは添付ファイルにある。 -- ToshinoriMaeno 2011-09-29 05:06:09
http://publicsuffix.org/list/ /LIST FORMAT
2. 目的
上位ドメインのクッキー（supercookies)を設定させないように使う。
- リストにないからと言って、安心するのはどうか。
ブラウザのcookieというものが欠陥だという考えもある。
- なぜ上位ドメインに対するcookieを保持させる必要があるのか。
そういうもので、DNSが制約されては、ドメイン売買の商売に差し支えるというのが、ICANNやJPレジストリの考えらしい。 -- ToshinoriMaeno 2011-09-29 07:29:47
The usefulness of this can be seen if we take the example of cookies. In the past, browsers used an algorithm which only denied setting wide-ranging cookies for top-level domains with no dots (e.g. com or org). However, this did not work for top-level domains where only third-level registrations are allowed (e.g. co.uk). In these cases, websites could set a cookie for .co.uk which would be passed onto every website registered under co.uk.
Since there was and remains no algorithmic method of finding the highest level at which a domain may be registered for a particular top-level domain (the policies differ with each registry), the only method is to create a list. This is the aim of the Public Suffix List.