Parallels Desktop Keys _verified_ Page

Parallels will show a red "License not valid" error. You will be placed in "read-only" mode, meaning you cannot save changes or run the VM for more than a few minutes at a time.

However, a quick Google search reveals a dark underbelly of the software world: thousands of results for “Parallels Desktop keys,” “free activation codes,” or “cracked licenses.” parallels desktop keys

Rarely. They sometimes run promotions for "Parallels Desktop for Chrome OS" or give away licenses to tech conference attendees, but they almost never give away free keys for standard Mac users. Parallels will show a red "License not valid" error