Whitelisting

Explicitly allowing some identified entities access to a particular privilege, service, mobility, access or recognition

"Whitelisting is the practice of explicitly allowing some identified entities access to a particular privilege, service, mobility, access or recognition. It is the reverse of blacklisting."https://en.wikipedia.org/wiki/Whitelisting 

From one member firm:

Our firm does some whitelisting in response to specific user requests and needs.  In addition, we use Sonicwall Content Filtering Service for website access security and monitoring.

"SonicWall CFS compares requested web sites against a massive database in the cloud containing millions of rated URLs, IP addresses and web sites. It provides administrators with the tools to create and apply policies that allow or deny access to sites based on individual or group identity, or by time of day, for over 50 pre-defined categories."