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Prevent users from sharing their login information

There are certain sites that have tutorials or other content of value and charge a membership fees. I was wondering what prevents users from buying membership on a site and then sharing their login info with friends/family or posting that information publicly online. That way, only one person actually buys the subscription but multiple people can gain access.
( 2 comments | on HN )
Re:Prevent users from sharing their login information by Shalle on Thursday May 16, 2013 @05:30PM (#5721284)
1 session per account is pretty useful, that way it's less likely users will borrow their account to other people. IP restrictions is another soloution.
Re:Prevent users from sharing their login information by sharmanaetor on Thursday May 16, 2013 @05:36PM (#5721331)
That's the only thing I could come up with as well.