1. The printing color is dim. 2. Only the song title is printed on the back of the disc. 3. The disc is relatively thin. 4. The specific address of the publisher cannot be found on the packaging. The address of pirated copies is usually somewhere. The address of the genuine film is clearly stated on the floor and number of a certain audio-visual store. The phone number is also 5. As long as it is played back on a slightly higher-end sound system, you will hear the difference from the genuine film. It is generally manifested in the rougher treble and the texture of the mid-bass. Poor, especially missing codes or wrong codes, causing jumps and pauses during playback, and even inability to search or playback. Because most pirated films are shoddily manufactured and cut corners, their surface protective layers are substandard, so they cannot be stored for a long time. What's more, due to the low reflection efficiency of the coating on the laser beam, the use of pirated films is detrimental to the service life of the laser record player, and it will accelerate the aging of the laser system. 6. You can start to identify pirated films based on their appearance. Usually, the outer box of pirated films is rough and the edges are not smooth; the printing and pictures on the envelope are poor in clarity, the pattern is dark, and the cover only has two color pages, and there is no specific introduction or description of the content. (It can be a thin booklet); the film base material is poor and thin, the coating layer has poor gloss, and there are leaks or even transparent when inspected by light, there are bubbles or water stains on the protective cover, and the printing is unclear , the copyright number is missing. Characteristics of genuine cassettes: 1. There is a concave and convex logo of “××Music” on the outer plastic of the cassette and on the front. 2. The outside of the cassette is equipped with a black or colored "××Music" cable in Chinese and English. 3. The "××Music" logo is printed on the cover, back and side. 4. The cover and back have the names of the head office and branches printed on them. Follow-up question: The folder contains the names of the composer, lyricist, recording engineer, recording studio and musician? Which folder