Our user accounts are secured with encryption that exceeds industry standards, and our servers employ the use of custom operating systems and software. (quadrigacx.com)
It's open - source, so people can take that source code and create custom operating systems from it. (howtogeek.com)
Also, it is one of the most popular custom operating system for Android tablets and phones, which is why you should install it on your tablet. (android.gs)