Even with safe search turned on, keywords that would normally be inappropriate (ex: those related to drugs or violence) for a K-12 setting are allowed by Google, Bing and Yahoo. To address this issue, we recommend URL based keyword blocking. Securly uses a keyword list of over 1000 keywords that has been carefully culled to avoid False Positives. This list can be built from publically available sources. We also recommend accounting for permutations of those keywords to address evasive behavior. For example, a student could type “h4(k1ng” instead of “hacking” or “a$$” instead of “ass”.