Licenses are permanent, no subscription fees or renewals.
Minor updates are free, you can request a discount when updating an app from v1 to v2.
Licenses are not hardware locked and issued for a specific person/company.
You can transfer your license(s) between your machines yourself, just not share it around to others. (that can result in a blacklisted license)
A single license can be used on 2 machines simultaneously in GUI mode (no limit for headless mode for the apps that support that).