I was talking about firewall protection. Basically every company has firewall protection, which basically protects the company's intranet system from virus attack. The majority of virus attacks originate from porn sites, therefore when such sites are accessed it will alert the user and block the webpage. In order to access the site you have to override the firewall. I know all this because a guy at work was convicted of accessing child abuse images and I found out the process from talking to the police involved when they were building the case.
If we look at the guys story it doesn't make sense for a number of reasons.
Firstly, child abuse images are not included in adult porn bundles because of the risk of being caught. Basically any forensic computer tech could analyse the data, trace it back, find the IP address and locate the source. They can then either prosecute if its in the UK or shut the site down. Child abuse rings do not want to risk this so they use encrypted images that can only be accessed through certain sites. If he has accessed level four images then I would be pretty certain he is accessing these sites as an established user.
Secondly, adult porn sites make money, lots of it. If they include child abuse images then they risk being closed down and this effects their profit and potentially leads to prosecution.
Thirdly, the length of time it takes to prosecute an individual is based on an over worked court system not the degree of guilt of the individual. A suspended sentence means the court found him guilty. This means they had enough evidence to prove his guilt beyond a reasonable doubt. The fact he did not do time does not lessen his guilt.
Fourthly, if the guy innocently accessed these images as part of an adult porn bundle he would be able to prove this through his browser history. The police would have gone into the work computer and looked at exactly what he was doing. In order to convict him they would have proven that he deliberately accessed these images and probably on more than one occasion. Despite what he says you don't get convicted on accidentally stumbling across abuse images.
This guy is full of shit and IMHO the fact that he is lying and manipulating your sister suggests he is a very real threat to those children.