This is an newsletter that discusses information related to Capture The Flag that will be held at DEF CON 20 this year.
You can download it from the following link: https://packetstormsecurity.com/files/download/109513/defcon20ctf-update.txt
Source: https://packetstormsecurity.com/files/109513/DEF-CON-20-Capture-The-Flag-Information.html