When you are on a remote shoot without internet, a corrupted SD card can cost you a $5,000 client. RescuePro runs entirely offline, works with proprietary RAW formats, and has the highest success rate for video recovery (MP4, MOV, etc.). The license key is insurance for your livelihood.
When you open RescuePro, it will ask for an "Activation Code" or "License Key."
Support often generates a replacement key if your claim is valid.