papoos on "How to prevent 2 connexions with the same login and pass ?"

Hi,

Is there anyway to forbid 2 connexions or more in a wordpress site with the same user account ? Is it exist a plug ?

The goal is to prevent the access to the site by 10 users (for example) with only one who has paid the "access subscription" and the others who use his login and pass.

Thank you for all your help !

Michael.