Speaking about porn blocking on linux, how can I make a service unstoppable without losing my root privilege? :/

You mean like that you can't stop a daemon/server or...?

@linuxxx yes I mean that. Or maybe a way to achive the same effect ?

@juchiast No clue but maybe look into SElinux...

Yeah selinux can permission things so that not even root can touch them. There are a couple of instances where this is the case.

Look up the shadow file, that is a file that not even root can read, write, modify (if memory serves). They do this with selinux I believe but possibly ACLs as well.

ls -alhz /etc/shadow
getfacl /etc/shadow