Sites requiring payment or a "license key" for DVD Shrink are illegitimate, as the software has always been freeware. Security Risks:
If you are looking for a keygen or a cracked version of a "2021 edition," you are putting your computer at significant risk.
As for the license key, DVD Shrink is actually a freeware application, which means you don't need to purchase a license or enter a license key to use it. The software has been freely available for download since its release, and users can use it without any restrictions.