Long before Nokia took up residence at Microsoft and became enamored with Windows Phone, the company had another mobile OS to care for: Symbian. For a while, it was the most widely used smartphone OS in the world, and according to a Finnish TV station, being its custodian was no easy task: In 2007 Nokia apparently paid several million euros to keep its encryption key private. MTV News (no, not that MTV) reports that criminals threatened to release the encryption key into the wild, potentially opening the OS to attacks and malware by unsavory programmers.