JCE is required for Java LiveUpdate to function correctly. It is the Java Cryptography Extensions that allow encrypting and decrypting of the liveupdate.conf file. It is the reason you are seeing this
After each update command /etc/liveupdate.conf seems to be overwritten with blank data for some reason
You need to install the JCE policy files into the lib/security sub-directory of the Java installation (not to mention that Sun (Oracle) Java is required, not Open Source Java as is shipped with most Linux distros). I recommend installing the Sun Java in the /opt/Symantec directory, installing the JCE files, then pointing JAVA_HOME in /etc/Symantec.conf to the correct version of Java.
Also I wasn't able to run "sav info -d" since I installed the RPMs, It just stalls and nothing happens.
This is likely happening due to a LiveUpdate process that is currently running. I've seen these hang in the past. Check your processes that are running and if you see any liveupdate processes (it would be a fairly lengthy java process that has liveupdate in the name) then kill it and remove the lock and tmp files from the liveupdate directory.