The difference lies in whether you have paid the royalties or not.

At present, the main way to get genuine copies is from physical media such as cassettes, CDs, and films. MP3s have always been D-versions in the past, and now it seems that they are not. There are some genuine MP3s that can be downloaded for a fee (how do you control this from being leaked?).

Well-pressed MP3, WMA, ACC and other digital music format files can actually reach very high To my ears, any sound quality above 196 sounds very good. Anything over 200 sounds no different.

To put it simply, the genuine sound quality is better and more comprehensive, and the pirated version cannot surpass it. Genuine, another difference is the royalties.