evercookie is a javascript API available that produces extremely persistent cookies in a browser. Its goal is to identify a client even after they've removed standard cookies, Flash cookies (Local Shared Objects or LSOs), and others.
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README
evercookie.fla
evercookie.js
evercookie.php
evercookie.swf
example.html
index.php
swfobject.js

README

evercookie 0.2 -- never forget.
by samy kamkar, 09/20/2010
http://samy.pl : code@samy.pl

The only files that need to be in your web directory are:
 evercookie.js
 evercookie.php
 evercookie.swf

If evercookie.php is missing or your server doesn't have PHP
support, evercookie will still function but without support
for auto-generated PNG caching.

If evercookie.swf is missing, evercookie will still function,
but without support for Local Shared Objects (Flash Cookies).