When the installation finished, the program actually worked. He was downloading 4K videos at lightning speed. He felt like he’d beaten the system. But the victory was short-lived.

Panic set in. Leo tried to open his editing software, but every file on his hard drive—his documentary footage, his portfolio, his family photos—now had the extension .CRYPT .

Frustrated by the limitations of free tools and unwilling to pay the subscription fee for a professional suite, Leo took a shortcut. He opened a browser tab and typed the phrase that would change everything: .