These files illustrate the effect of the Noise Control technology being developed. The 'noise' is not added to the audio, to be then removed later. Instead, it *is* the audio. It can only be reverted using a 'private key'. Each track can have hundreds of millions of keys. Only one key will revert the noise. Each recipient therefore has a unique track/key combination
The three files are: original file; low level noise added file; high level noise added file;
The level of noise added is set at the beginning (ranging from 'unnoticeable' to 'obliterating the song') or could be set to increase over time or number of plays. It cannot be removed without the *correct* key. Using an incorrect key will make it noisier.