Perpetual License
This is the Standard License that gives you the right to own and run the software forever, similarly to buying a packaged software in a store.  Minor software upgrades/updates/patches will be offered free of charge for unlimited time.  However, major software upgrades may be offered in the future at an additional cost, for example an upgrade from version 4.0 to version 5.0 may be priced at $200 (exact pricing to be determined at the time of the release). You can protect yourself from additional upgrade fees by subscribing to the Annual Maintenance Plan, or by purchasing a non-perpetual license (subscription) instead.
Non-Perpetual License
This is License Rental that gives you the opportunity to cost-effectively "subscribe" to, or rent, licenses of CodeCharge Studio software on an annual basis.  You  benefit by having the right to always use the latest version of the product at no additional charge.  For tax-saving purposes, you can also report such software expenditure as a business expense rather than depreciating capital investment.