You found a letter that may shed light on recent events.Redacted.pdf:
That "super secret access code" looks interesting. I wonder if the info behind the black boxes is really gone for good?Solution:
In a letter, I have pdf file and in this file have black boxes to hidden text, It is a flag. when I read a hint, I find some tool to remove black boxes and I found Nitro PDF Professional 9 trial. It work.!!
1. Open PDF File.
2. Edit > Edit
3. Click and drag to remove black boxes, It will show the flag.