Audio recordings that include Parental Advisory labels in their original formats are generally released in censored versions that reduces or completely eliminates the questionable material.[10] They are recognized as "clean" editions by the RIAA, and are left unlabeled in their revised formats.[2] American retailers including Best Buy and f.y.e. distribute explicit and censored records;[11] Target has sold both versions of a given record,[12] although has occasionally offered only the explicit version depending on the product.[13] Walmart and their affiliated properties are well known for only carrying censored versions of records; in one instance, the retailer refused to distribute Green Day's 2009 album 21st Century Breakdown because they were not given the "clean" copies that they requested.[14] Online music stores, including the iTunes Store,[15] generally have the Parental Advisory logo embedded into digital files.[8]