I've had that happen. Reseat your HDMI cable on both ends, and it should go away. If not, replace your HDMI cable with another one.
Two things were happening here: 1: The program is encrypted. 2: the receiver can't verify the encryption from the receiver to your tv set is good, because of something wrong with the HDMI signal return.
This is the most logical explanation. Disruption in the connection in the cabling, but it doesn't explain why it happened with just one program on a channel where that same program is recorded every day for the past several years. On a channel CNBC, that has all other programs recorded before and after this one with no issues. Yet one program refuses to play. Anyway, I was able to watch it from the beginning to the end, test it again after the recording had completed and it failed. I was able to delete the program. Frank, these shows air live, daily so it isn't that it was some prerecorded special.
I rarely watch live TV, always watch from the DVR and time delay. Once I watch I usually delete except when I decide it is worth keeping and then I transfer to an external USB hard drive.
For those who think of this as a simple TV set, it's not. It's a home theater setting with fairly high end equipment.
VIP744K to a Denon AVR4311ci receiver to a Sony VPL VW90ES projector. I think anyone would be hard pressed to suggest these devices are not HDCP compliant, but a loose cable is possible, but then I would suspect this to be true of every program on the DVR on that channel.
It appears this was some fluke in the system. Hopefully it doesn't happen again. The only other explanation may have been a developing hardware failure with my 722K and it's HDMI circuit, that malfunctioned on just one show.