DVD menus could be created and edited in Adobe Photoshop using special layering techniques.
[1] While Premiere Pro CC has moved to the Creative Cloud, Encore has now been discontinued.
Versions 1.0 and 1.5 required a separate license fee (rather than making 1.5 available as a free update).
Video and audio streams could be embedded in the DVD and be made to play when certain elements of the menu are interacted with.
It had similar functionality to Adobe Flash and Premiere Pro, due to its ability to both edit video on a timeline and embed interactive content.