From the article:
A sensitive government document detailing a classified computer database has been given to the CBC after it was found lying on an Ottawa street in a rain-stained, tire-marked brown envelope.
The document is a risk assessment of an Environment Canada classified environmental enforcement database. It details a number of the system's failings and describes exactly how the data could be attacked and corrupted, the CBC's James Cudmore reported.
NEMISIS, a semi-secret system and database which has been around since the late 90's (as detailed in some heavy documents here)[PDF] is due for an security overhaul. Somebody might have just happened to drop some medium-risk "Protected B" assessments out of their briefcase. Environment Canada has responded and is doing some internal internal investigations. The interesting this is that nobody has said whether or not the documents could have already been looked before they were found by the people that turned them in.
Aside from industrial fraud and ecological activism, The name 'NEMESIS' alone could have prompted an attack."