I have configured a C927-4p with a site to site vpn which is currently running on the eval SecurityK9 license. I have had a quote from our software provider and has given me the below options. I've looked at the differences and the site is an 80/20 circuit so I am assuming the "SL-900-SEC" will be the one to go for ? I've not really dealt with this part before as this was "handed to me", I have some limited Cisco experience but some parts (like this) I tend to question myself especially when alot of money is involved.
Based on the information provided, it seems that the SL-900-SEC= Security License for Cisco ISR 900 would be the appropriate choice for your C927-4P router. This license enables security features such as VPN, firewall, and intrusion prevention, which are suitable for a site-to-site VPN setup. The NPE (No Payload Encryption) version of the license, SL-900-SECNPE=, is intended for countries where encryption is restricted and should not be necessary for your use case.
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