Sites may list "Volume License Keys" (GVLK) or cheap $5 keys from marketplaces like eBay. These are often unauthorized for resale, frequently blacklisted by Parallels, and may stop working without warning. Legitimate Ways to Use Parallels for Free
You don't need a leaked key to start using the software safely. Parallels offers official methods to test and use their product: Parallels Desktop for Mac trial period
Searching for free activation keys typically yields two types of results, both of which are problematic:

