DARPA Shredder Challenge 2011

DARPA Shredder Challenge 2011 was a prize competition for exploring methods to reconstruct documents shredded by a variety of paper shredding techniques. The aim of the challenge was to "assess potential capabilities that could be used by the U.S. warfighters operating in war zones, but might also identify vulnerabilities to sensitive information that is protected by shredding practices throughout the U.S. national security community".

Source: Wikipedia — DARPA Shredder Challenge 2011 (CC BY-SA 4.0)