Some record companies require us to insert identifiers in the metadata that accompanies music when you download it from the Digital Music Store or your Amazon Music library. This includes music you have purchased from Amazon.co.uk and matched music imported to your Amazon Music library from your device. These identifiers may include a random number Amazon assigns to your order or copy, purchase date and time, an indicator that the music was downloaded from Amazon, codes that identify the album and song (the UPC and ISRC), Amazon's digital signature, an identifier that can be used to determine whether the audio has been modified, and an indicator whether the music was purchased from the Digital Music Store or imported to your Amazon Music library.
Songs sold in the Digital Music Store that include these identifiers are marked on their product detail page. These identifiers do not affect the playback experience in any way.
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