Watch DVR Recorded shows on my IPad - DirecTV

Why can I only watch some of my recorded shows but not all of them? I am traveling and an example is I watch all my recorded Blue Bloods, but I tried to watch the same show that was DVR last night I can't. I show it in my recording, but can't watch. Also shows I have DVR on the discovery channel it will not let me watch. It is kind of hit and miss on what I can watch. Any suggestions?

This question, "Watch DVR Recorded shows on my IPad," is about DirecTV channels, programming, equipment, and sports.