Ah, this is where I read it, first post in this thread, https://forum.silicondust.com/forum/viewtopic.php?t=78888&sid=ac4e9fd056f28b4c2609525c0a6c105d "ATSC 3.0 DRM: Some ATSC 3.0 channels may be DRM encrypted and will not work. If an ATSC 3.0 channel is DRM encrypted the HDHomeRun FLEX 4K ...

Wish I could remember where I saw that. Anyway, thanks for the info, it is what it is!

I thought I read somewhere (re the Flex 4K) that if an ATSC 3.0 channel is DRMd, then the ATSC 1.0 simulcast would display instead, but all I see is the "can't display this" message. Did I misread something, or is this a Flex 4K feature not supported in the Connect 4K, or something?