Internet Filtering 

A ‘filter’ is a program that can prevent certain content on web sites from being made available or displayed. The most common use is to prevent content that could be deemed violent, inappropriate or pornographic from being viewed. Public libraries usually have a mix of filtered and non-filtered computer workstations available to both prevent children from accessing inappropriate content, and to ensure people are able to access the information they need. Libraries will have policies on Internet Filtering.

CLA’s Net Safe, Net Smart Toolkit
OLA’s Statement on The Intellectual Rights of the Individual  
Ontario Library Information Technology Association’s Internet Access Toolkit  
CLA’s Position Statement on Internet Access