If this is the Tom's Hardware article on the leak... notable by their absence are some of the countries using the Chinese hardware and software for censoring their citizens, including Iran, Cuba, Vietnam, Zimbabwe, Russia, and Belarus.

I had to edit the title to make it fit. Actual title of article is:

China’s Great Firewall suffers its biggest leak ever as 500GB of source code and docs spill online — censorship tool has been sold to three different countries

Another discussion: https://news.ycombinator.com/item?id=45233415

Great Firewall in a Box!