Digital booklet
Encyclopedia
Digital booklets are the digital equivalent of liner notes
Liner notes
Liner notes are the writings found in booklets which come inserted into the compact disc jewel case or the equivalent packaging for vinyl records and cassettes.-Origin:...

 that often accompany digital music purchases
Music download
A music download is the transferral of music from an Internet-facing computer or website to a user's local computer. This term encompasses both legal downloads and downloads of copyright material without permission or payment...

. They are most commonly distributed in Portable Document Format
Portable Document Format
Portable Document Format is an open standard for document exchange. This file format, created by Adobe Systems in 1993, is used for representing documents in a manner independent of application software, hardware, and operating systems....

. One well-known distributor of digital booklets with digital purchases is the iTunes Store
ITunes Store
The iTunes Store is a software-based online digital media store operated by Apple. Opening as the iTunes Music Store on April 28, 2003, with over 200,000 items to purchase, it is, as of April 2008, the number-one music vendor in the United States...

; the first instance of this on the iTunes Store was the release of the album How to Dismantle an Atomic Bomb
How to Dismantle an Atomic Bomb
How to Dismantle an Atomic Bomb is the eleventh studio album by Irish rock band U2, released in November 2004. Much like their previous album, All That You Can't Leave Behind, How to Dismantle an Atomic Bomb was commercially successful and critically acclaimed and maintains a more traditional rock...

by rock band U2
U2
U2 are an Irish rock band from Dublin. Formed in 1976, the group consists of Bono , The Edge , Adam Clayton , and Larry Mullen, Jr. . U2's early sound was rooted in post-punk but eventually grew to incorporate influences from many genres of popular music...

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