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Most QR codes are just text. When scanned with a USB reader, the reader just types out the text really quickly.
It's difficult to type in a 55-character bitlocker key. This tool will create a QR code from a bitlocker key so you can plug a 2D barcode scanner into the affected computer, then scan the picture from the program.
There's a section to allow you to create a QR with some cmd code to simplify the unlock and even delete a file. You can keep concatenating with &&. The screenshots...
Multi-platform QR code generator from information supplied
QRGen creates QR codes from contact information, written in Java.
It requires the tool qrencode in order to work, qrencode is freely available at http://fukuchi.org/works/qrencode (Linux/Mac OS/UNIX) , or http://code.google.com/p/qrencode-win32/ (Windows), or Ubuntu Software Centre.