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This is a perpetual license and you will be billed upfront.
Perpetual license model You can use the software for life but you cannot upgrade to a new major version of the software without purchasing a new license.
License agreement By purchasing you also agree to be legally bound to the End User License Agreement for DynMock (Roaming commercial license):https://www.syssurge.com/Products/DynMock/Roaming-commercial-license.aspx