A compromise could be to setup the below in DNS to force "safe search" in google so you can "decrypt" Google
1. Add a new CNAME record on your local DNS server for your local Google domain(s) pointing to forcesafesearch.google.com. For this example, we will be using www.google.com. Create a CNAME record for www.google.com that points to forcesafesearch.google.com.
2. Clear your DNS cache of the saved www.google.com record.
3. Make a new search and you should be prompted that SafeSearch is enabled. As long as this CNAME record is in place, SafeSearch will be enforced on the network.