from the what-were-they-thinking dept.
theodp writes "Microsoft has applied for a patent for 'securely providing advertising subsidized computer usage.' The application describes how face-recognition webcams and CAPTCHAs can be used in schools to ensure that computer users are paying attention to ads, and the recourse of 'disabling or even repossessing the computer' if they are not."
egrep patterns are full regular expressions; it uses a fast deterministic
algorithm that sometimes needs exponential space.
-- unix manuals