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.
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.