. ♪ wechsler comeback. you're watching "the pulse."e is now familiar with the nsa and the nsa is probably pretty familiar with you. but why is this a threat to the nsa? this is a free software technology that allows users to keep their online residence anonymous, making it very difficult for the nsa to track your activity. sam grobart explains how it works and reveals the surprising source behind the funding. >> with all this talk about the nsa and encrypted data, you might be wondering if there is a way to keep your online activity on the down low. turns out there is a way. it is a software technology. it stands for the onion router. referring to the vegetable wash many layers. tor is free software you can download onto your pc or smartphone which will anonymize your data. how do they do it? they take your data and bounce it around the world over several different data nodes. those nodes only know one thing, where to send your data next. that way, no person or agency can figure out where the data came from or where the data is going.