content: Not sure which you are asking about. MX Linux17.1 is as secure as any Linux distro, which is pretty damn secure, but its not a high security distro like TAILS, Parrot, Whonix, etc. I mostly use XP Pro, but for online shopping/banking I switch to MX Linux, and run it as LiveCD. ReactOS, KolibriOS And Syllable I never got to connect to the internet, so can't say how secure those are...since they would not connect, I'd guess you cannot get more secure than that! Icaros connects to the internet, but it's a really weird (in a good but strange way) OS, and I'm just now rummaging around in its innards, so I've not found a firewall yet. That's not super important to me, as I have a hardware (SPI & NAT) firewall on the router. Anyway, it's too soon to tell about Icaros, other than foolin' with it amuses the hell outta me...no idea why. Until I got MX Linux, all the other distros were a grind on my nerves, so it ain't like I just love messing with new operating systems.