How to create a cookie that cannot be deleted by the user

For last few years i was searching for a method to set a cookie that cannot deleted by the user. it will be use full when we need to track a user activity. for example we only want a user to register one time from a PC in our web site it is not possible through native cookie.

following is the working demo

http://www.actionscript.co.in/uploads/cookie-example/

Source file download

http://www.actionscript.co.in/uploads/cookie-example/cookie.zip

Please post the suggestions and bugs


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