I've been trying to set up local web-filtering (no license required, right?) on customer's SRX 240. Every guide that I had managed to find said that it was to be configured under "edit security utm". But there is no "utm" option on this device. The only idea I got (by cat /etc/rc.utm) is that UTM requires at least 768MB RAM while I got only 512. That`s why "utm" is missing. Anyone can confirm that? Cheers!
Look at the Juniper SRX datasheet for more detail. If you use the SRX100B model, you can buy an additional license to use UTM. The SRX100B has 1GB RAM, but only half of that is accessible.