I do not know if Confluence License is permanent or not ?. In case, I buy as below then I have to pay again for the second year or just pay for support only ?
|1 Confluence (Server) 100 Users: Commercial License|
|- Support Period: 12 month(s)|
I am not sure since I have never let our instance expire but I would assume some functionality would not work anymore. You probably won't be able to create new users or add new content but pages may still be viewable at least. You would also probably get a message somewhere on the page stating that your license has expired. Their business is based on licensing so you have to keep renewing the license if you want to use it.
I'm no expert on licensing, but Atlassian states (https://www.atlassian.com/licensing/confluence/#serverlicenses-1):
Our software licenses entitle you to perpetual use, and include 12 months maintenance (updates/support) commencing from the date of purchase. Renewing maintenance is entirely optional.
This makes me assume that you need not to renew. Although new and interesting features will probably tempt you to do so ...
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