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A commercial license is needed on all production Jira servers for doing production work. Every commercial license comes with an unlimited number of developer licenses that can be used on non-production Jira instances corresponding to the one where the commercial license is installed. E.g. in a Test-Staging-Production scenario a commercial CMJ license is needed only on the Production Jiraproduction Jira.
But for For a migration a commercial license is needed on both only for the source and target Jira servers, as they are usually both production Jira server. If the license is needed only for the duration of a migration, you can purchase a short-term (monthly) one directly from us - please open a license request at the Appfire customer portal For the source production Jira server, you can also use commercial or trial licenses, or you can reach out at our Support Portal, and we can provide you with a free license.
You can use a trial license for evaluation purposes only.