WordPress membership plug-in which are MultiSite compatible?

Hi there,

I don’t know if I’ve posted this at a wrong place, if so sorry…
I’ve looked for a membership plug-in which I can use at my WordPress Network but haven’t really found anything working yet.

The plug-in should just make it possible to have protected content with username and password. Also the plug-in shall not use WordPress users but has it’s own database table.

I would therefore hear you guys if you know any plug-ins I maybe could take a closer look at or maybe a plug-in you could recommend?

Thanks!