Content Restriction Ideas

I was trying to do subscription system which is only for registered user. Till registration stage, I am okie. But I don't want user to share their username and password with others because of the paid content. How can i prevent ?

1. Check with IP, but what if they are on dynamic IP ? Using proxy ?
2. Store cookies can change ?

Can anyone please kindly suggest how can i prevent ? I know there's no 100% bullet proof, but somehow, alittle bit tight security system.

Language will be with php, mysql, javascript开发者_Python百科.

I recommend heuristics based approach -- if you detect something suspicious (eg. user connecting from many different IP-s) then you log this and this increments some counter in users's record, if the counter grows big enough, then you get notification and decide what to do.

It won't eliminate all cases of account sharing but hints you the problem users.

when your content is payed content, tell the users that they have to enter ther credit card informations every 10th login. I think this will stop them to share account. (When CC informations are wrong, the account will be closed).

Other idea: Limit the Sessions for one user to 2 - 3. They will think twice to share their credentials if they are not able to login when their friends are connected.