How do I get the "Content scrambled" box off my screen?

I have a Bush LCD40883F1080P and subscribe to ESPN. Everytime I turn to this channel I get a black box with "Content scrambled" in the middle of my screen. I phoned ESPN and they say it must be due to the TV, but I can't find an online support service for Bush. If I can't shift this box then I will be forced to cancel my subscription with them.

Any help greatly appreciated. Thans