...Interception allows SSL traffic to be decrypted so it can be analysed and the content checked for viruses and other undesirablematerial. One of the reasons it is rarely found in standard security systems is because of the processor-intensive calculations...
http://www.securitypark.co.uk/security_article262884.html
...Internet and American Life Project. "Most kids want to be protected," she said. "A lot of exposure to undesirablematerial is by accident. Most kids don't want to see it, so most aren't going to be trying to circumvent the protections...
http://news.zdnet.com/2100-9595_22-6030200-2.html