The requirement to have a Remote Monitoring Option Key installed to see the snapshots of the cameras and content on the Call Control page of the Web Interface was introduced in software release TC7.3.3. If you're running a software release prior to this, then you will be able to see the snapshots without such a key installed.
To get the Remote Monitoring Key, you need to purchase it from Cisco, it's around US$100 list price per endpoint.
The licence you want can be found under the top level SKU L-TP-RM. Then pick L-C-SERIES-RM, L-MX-SERIES-RM, L-SX-SERIES-RM, L-EX-SERIES-RM or L-PROF-SERIES-RM underneath, depending on which model endpoint you need it for.
There are quite a number of people in the forums who see this as nothing but a money grab from Cisco as they're now charging for a feature that should be free.
This has been discussed many times in these forums before - some sample links about this functionality, the licences required, and issues with the functionality are:
Wayne
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Wayne
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