Nothing.
Your licence lets you use any version of JIRA released before the end of the licence.
Thanks a lot. But I talked about Confluence, upgrading is free during one year, but after what happened? For example after 2 year? Thanks
Sorry, Jira, Confluence and the rest all have the same licence model. Once your licence expires, you will not be able to upgrade to a version released after the date of expiry. You can renew after a licence lapse, but if it's been over a year, you'll simply need a new licence.
You will need to buy a new 1-year support:
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