The Advanced group in display conditions option lets you add conditions that restrict content access specific to IP addresses and if shared via a referrer.
With these you can limit the users views to people whose IP comes in the range specified by you in the backend and to those who are visiting the page via some other website and using their domain as indicators mentioned in the backend.
To set this go to the Display Conditions > Choose to Include/Exclude those conditions. In case of Referrer URL add the links and, in case of IP address add the IPs included.
Irrespective of matching all the conditions if any of these turns true it will be applied.