: The files were released without Digital Rights Management, allowing them to be played on any device supporting the AAC format. Audio Quality
: This suggests that the music files inside the archive are in AAC (Advanced Audio Coding) format, which is a type of audio compression. AAC files are known for their good sound quality and are commonly used in digital music stores like iTunes. "iTunes Plus" was a term used by Apple to denote a higher quality version of music sold through iTunes, which was free from DRM (Digital Rights Management) restrictions.
: The box set also featured the band’s first U.S. concert film, further enticing long-time fans to buy the digital versions of albums they likely already owned on vinyl or CD. If you are looking for an essay on the
concert film, marking the first official release of the band's first U.S. concert. Audio Specs and Technical Details Why weren't The Beatles on iTunes? | HowStuffWorks
Whether you are a purist who insists on the original mono vinyl or a modern listener streaming the latest Dolby Atmos mix, the 2010 iTunes Plus release remains a pivotal chapter in how we consume the greatest catalog in pop history.