You always have a kind of Subscription for AnyConnect. There are three models: Subscription per Person that uses the Cisco Secure Client. Every User needs a license. The term is typically three or five years (which have the best price/value ratio) and after the term it has to be renewed. Same as 1) but you "buy" the license (it is perpetual). But for Updates of the client you need a service contract. Licensed per device, but this is only useful if you have many users but only a small amount of them connect at the same time. Again, you need a service contract. In 99% (just a guess) option 1 is the way to go. https://www.cisco.com/c/en/us/products/collateral/security/anyconnect-secure-mobility-client/secure-client-og.html
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