Na stretnutí riaditeľov akademických knižníc som prezentoval o vybraných zaujímavostiach a odporúčaniach ku stratégii informačnej bezpečnosti.

From: www.xkcd.com/936

For the most part this is all fine with peoples' faces as there isn't a convenient way to reverse the blur back into a photo so detailed that you can recognise the photo. So that's good if that is what you intended. However, many people also resort to blurring sensitive numbers and text.

This article illustrates why that is a BAD idea...