From Bob Geldof's Official Website.
Only 10 hours on DVD were officially authorized out of the 16 hour concert.
What you have is NOT official. It is a bootleg! http://www.bobgeldof.info/Charity/liveaid.html
An official 4-DVD set of the Live Aid concerts was released on November 8, 2004. It contains
10-hour partial footage of the 16-hour length concert. The DVD was produced by Geldof's company, Woodcharm Ltd., and distributed by Warner Music Group.
The decision to finally release it was taken by Bob Geldof nearly 20 years after the original concerts, after he found a number of pirate copies of the concert on the Internet (see full story here). There has been controversy over the DVD release because a decision had been taken for a substantial number of tracks not to be included in this edited version.
The most complete footage that exists is from the BBC, and it was the main source of the DVD. During production on the official DVD, MTV lent Woodcharm Ltd. their B-roll and alternate camera footage; this was an additional source of the U.S. footage that appears on the official DVD.
Working from the original BBC and MTV footage, judicious decisions were made on which acts would be included and which ones would not (for example, Rick Springfield, The Four Tops, The Hooters, and Power Station are among those acts that were left off the DVD). Many of the artists' songs that were performed were also omitted. For example Madonna performed 3 solo songs in the concert, but only 2 were included on DVD - "Love Makes the World Go 'Round" was omitted.
Two performers were left off at their own request - Led Zeppelin and Santana. The rock band Led Zeppelin defended their decision not to be included on the grounds that their performance was "sub-standard," but to lend their support Jimmy Page and Robert Plant have pledged to donate proceeds from an upcoming Led Zeppelin DVD release to the campaign, and John Paul Jones has pledged proceeds from his current American tour with Mutual Admiration Society.
The British Chancellor of the Exchequer Gordon Brown decided the VAT collected on the DVD will be given back to the charity, which will raise an extra £5 for every DVD sold.