See "What happens when the included maintenance ends?" section here: https://www.atlassian.com/licensing/purchase-licensing#softwaremaintenance-4
4. What happens when the included maintenance ends?
After the first 12 months, your software maintenance will expire and you will no longer be able to receive technical support or software updates. Renewing your software maintenance is done purely at your discretion and can be renewed in advance of your maintenance expiration to ensure uninterrupted access to the support and software updates.
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