Who knows if the so-called authentic wallpaper has a bar code or something? There are many imitations now. What about the wallpaper of th trademark? 3Q
Yes, it consists of a product code representing 12 bits and a check code of 1 bit. The first two digits of the product code are country codes, such as 00-09 in the United States, 30-37 in France, 40-44 in Germany, 45-49 in Japan, 69 in China and 80-83 in Italy. Now we must be careful when copying wallpaper. The copied wallpaper may have some problems in environmental protection.