Let's keep this simple: we don't own the exams, we just link to them.
The VCE materials belong to the VCAA, and the HSC materials belong to NESA. We don't host the PDFs, alter them, or claim we made them. We just point you straight to the official government sites, and hopefully that makes your life easier.
Our actual website code and design are open source and licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
But obviously, that doesn't mean the government exams are open source — they still belong to the government.