To demonstrate my point, I tried to go to the following link:
BBC NEWS | The great firewall of China
And was blocked:
The webpage [URL] that you would like to open can not be displayed because it belongs to category Press*. If you need to access the professional content of this category or page, we ask you to submit [an internal permission request] selecting the Press* category.
Otherwise if you believe that this page is not categorized correctly, please let us know using the [IT helpdesk] application.
The other major category I’ve discovered so far is Purchases*, wherein I am encourages to contact the procurement department. Sigh.