How difficult would it be to defeat that completely or fake a different date? If people can find subtle noise that fools computer vision algorithms, can somethi

How difficult would it be to defeat that completely or fake a different date? If people can find subtle noise that fools computer vision algorithms, can something similar not be applied to this? A band-pass filter might be a little simplistic because it's never 100% attenuated and the harmonics persist, so given a long enough sample you would probably be able to correlate. But perhaps more advanced techniques exist, if you know exactly what the other party is looking for?