8 April 2016 Last updated at 11:35 BST
Video showing the trio throwing petrol bombs and shooting weapons can be shown for the first time after an anonymity order expired.
Jacob Crouch and Ryan Towell, who are both now 20, had fought to prevent their identities being revealed, but the Court of Appeal overturned the order.
They appear in the video alongside Michael Piggin, who was detained indefinitely in 2014 after he was found to have masterminded the thwarted assault on Burleigh College, Loughborough.
Footage of three 17 year olds making preparations for a Columbine-style attack on an English school can be shown for the first time.