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Ich weiß nicht ob Amazon es verwendet aber theoretisch kann man MP3s ein Wasserzeichen geben wo dran drin steht wer das gekauft hat.
Not even Watermarks.

Zitat Zitat
A study by Elliot Van Buskirk of Wired News's Listening Post blog investigated whether Amazon MP3 was watermarking tracks with personally identifiable information. Van Buskirk quoted an Amazon spokesperson as saying, "Amazon does not apply watermarks. Files are generally provided to us from the labels and some labels use watermarks to identify the retailer who sold the tracks (there is no information on the tracks that identifies the customer)." The study concluded that although tracks may be watermarked to indicate that they were purchased on Amazon MP3, there is no data to indicate which specific customer purchased a given MP3 file.