Reaction
Initial reaction to Amazon MP3 was generally positive. The unofficial Apple Weblog praised the lack of DRM especially given that track prices were cheaper than iTunes Plus songs at launch, but the reviewer considered the user experience better in iTunes than on the Amazon web site. Om Malik of GigaOM also praised the lack of DRM and the high bitrate but disliked the need to install another application to download albums. Overall, the reviewer said "…I think it makes sense for everyone to browse the Amazon store before hitting the 'buy' button on iTunes."
A 2007 study by Eliot 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. This observation reflected Amazon's policy at the time.
By 2011, however, the policy had changed and certain explicitly labeled tracks embed "Record Company Required Metadata" including, among other information, unique identifiers:
Embedded in the metadata of each purchased MP3 from are a random number Amazon assigns to your order, the Amazon store name, the purchase date and time, codes that identify the album and song (the UPC and ISRC), Amazon’s digital signature, and an identifier that can be used to determine whether the audio has been modified. In addition, Amazon inserts the first part of the email address associated with your Amazon.com account
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—Albert Camus (1913–1960)