Hacking the system requires reproducing an identical "hum" and not necessarily compressing it. It seems difficult but I wonder if it is impossible for someone with a synthesizer and access to their database.
You don't need their database, you just need to record some background noise (assuming that you can replace the hum in your recording with another one).
interested in the false positive (hum is present) in which case the hum you need to "replace" something with needs to have signal correlations that match the ones in the database they've built up.
