https://sales.jetbrains.com/hc/en-gb/articles/207240845-What-is-a-perpetual-fallback-license-and-how-do-I-use-one
What is a perpetual fallback license, and how do I use one? – Licensing and Purchasing FAQ
The perpetual fallback license is a part of JetBrains' subscription system. It allows you to use a particular software version...
what is aperpetual fallback license
https://support.keepassium.com/kb/license-rent-own/
What is rent-to-own (perpetual fallback) license? | KeePassium
Learn how to set up and use KeePassium, solve problems and contact support.
what is rent to ownperpetual fallback licensekeepassium