A spokesperson from ICE confirmed that it was a legitimate seizure and that there is an ongoing investigation into the matter.
According to a description on Mahalo, ATDHE "specializes particularly in live sports, but also features general programming from networks such as ABC, CBS, NBC and FOX. The website, although popular, has come under fire as to any copyright restrictions it may be violating in operating the service."
The video streaming site has resurfaced at: http://atdhe.me/
It's great for watching sports at work