As Ankit Fadia, 28, works on his laptop, his fingers furiously tapping away, there is silence in the packed auditorium in central Delhi.
His projector throws images of codes and symbols onto a white wall, and then suddenly, the crowd bursts into spontaneous applause.
Another website has been successfully hacked and unlocked.
But rather than doing something illegal, Mr Fadia, who describes himself as an ethical hacker, says he is trying to protect people and businesses from a rising wave of cyber crime.
Clipping is a handy way to collect important slides you want to go back to later.