What is "privatos"

PrivatOS was an operating system used in the Blackphone from June 1, 2014, to June 30, 2016. It was targeted at users who sought improved privacy and security. It provided encryption for phone calls, emails, texts, and internet browsing. PrivatOS was a modified version of Android, forked from Android 4.4.2, that came with a bundle of security-minded tools. However, in contrast to Android, PrivatOS was not open source. The company that shipped PrivatOS, SGP Technologies is a joint venture between the makers of GeeksPhone, and Silent Circle.