limit concurrent user logins in Plone/Zope

I want to limit the开发者_StackOverflow中文版 number of active sessions a user can have in Plone/Zope. We are selling access to digital content and ideally want to limit how many concurrent logins can use one set of credentials.

What would be the best way to achieve this?

Thanks, Peter

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You can try the NoDuplicateLogin PAS plugin. http://plone.org/products/noduplicatelogin