How to prevent multiple authentication in a web application / website?

Question

There is a site with a registered user area, all of them have their own user / pass.

The problem is that some of them are trying to share authentication information with others to help them finish the job.

There is no way to restrict by ip-address, because for each dynamic ip is provided.

What could be the best solution? store sessions in a database? how to recover if they do not exit the system properly?

thank

Answer 1

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