Just wanted to add a bit more information about license.
As I said early, the license will be freed (from old clients upon deletion) and reused by SEPM (for new client) internally in the network.
However, Symantec cloud-based servers do not currently implement any level of license re-use or scavenging of licenses from decommissioned clients. This means that although the SEPM may correctly report no "over-deployment" of the license, the cloud-based systems hosted by Symantec will still register an over-deployment, and will not provision the new client with a CAT.
So, when a client connects to the reputation database, the license count is pinned with that hardware ID. Hence if you have 10 license and 10 clients with SEP, all these client will occupy the license that you have on the cloud. Hence if you uninstall SEP from one of these clients and install it on a new computer, the cloud will see the new one as 11th computer (thought the SEPM will be resuing the 10th license for the new computer). This prevents the 11th computer from being able to submit reputation data to the Symantec Reputation database. However the client will be able to check the reputation database to fetch information on files.
Reference: Client Authentication Tokens, License Counts and Submitting content to Symantec's Cloud-based Reputation Service
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