For a similar reason it took 20 years to release a Live Aid DVD.
From Wiki:
A great program though. Doing one for this decade might lose some of the effect, unless they wait a few years.RTÉ has said that, because of the number of clips from external companies used in the series, it would be infeasible to release it on VHS or DVD. It claims that securing "video clearance" for each clip and song would make any release prohibitively expensive.
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