How to prevent multiple authentication in a web app / site?

D

Daniel4

New Member
There's a site with registered users area, they all have their own user/pass.The problem is, some of then try to share the authentication info with others to help them finish their job.There's no posibility to restrict by ip adress because there's a dynamic-ip provided for everyone.What could be the best solution? store sessions in the database? how to restore if they don't logout properly?Thanks
 
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