In theory, couldn’t Channels use the Widevine license on the streaming device to decode/encode streams? I think Kodi does something like that with InputStream Adaptive. It wouldn’t work on all devices and I don’t know if recording would work (maybe it could but playback would also require Widevine?)
I honestly don’t understand how it works so maybe I’m completely off base here.
For now I came up with a solution for currently just since losing USA network last week. I thought I was going to go to Hulu On Demand which is $15 dollars a month and I wouldn’t be watching anything else on there for that $15 dollars a month. So I played around this past weekend with my CamLink 4K and the original HD Apple TV I had laying around and downloaded USA Network app and signed in with my streaming provider and started playing back the live tv channel of the USA Network. Opened up OBS and started recording the channel and everything seems to be working out great! Only thing it I tried choosing the lowest setting and for 2 hours of recording testing it was up to 15gb ish. But it will be the only thing I will be recording and I will delete it once I get done watching it. Also, you can through it into Channels to detect the commercials for auto skip.
This is what I have came up with currently. If I forget to manually record I can also go play it back the next day from on demand for the USA network app but for now this is my solution. I also have a buddy on his Plex server that puts up the show on his server and so I have a few different options. Through all of this I just didn’t want to start spending money on a live streaming service so I could start watching on USA network. But eventually it is starting to look that way. Just the matter of time I guess. I just wish it they had a la cart TV channels.
Similar thought being discussed here:
Did some digging into inputsteam.adaptive, some of the comments and forks are interesting... 
UGH. I knew this was coming. NBC has been glitchy and unreliable for several months...with my local NBC just disappearing randomly or being some far away station one day and the normal one the next. Sucks. I do have a family member running several HDHomeRun with all the OTA and I can watch it via Channels or Plex remotely...I suppose I could pipe everything together (the remaining TVE plus the OTA I could nab from those remote streams) but not sure I want to bother with it honestly. I'm getting tired of playing this cat and mouse game. My feeling is there needs to be legislation from the government to mandate these local stations quit playing games with DRM and encryption and all this garbage...should be must-carry especially when they are extracting tens of millions of dollars in carriage fees ... it's literal extortion. Just venting. Thanks for the updates - this certainly isn't Channels DVR team fault and I'm sure they are working on things but it just sucks for the end users.
Lost my NBC (WESH in Orlando) yesterday, error is 504 Gateway timeout. Guess I was lucky to have it this long.
Hopefully a workaround will be made to allow DVRing, don't care about anything live.
So im still getting NBC but i no longer get USA network. USA still haa a login on its site but ww all lost it bwcause they uae DRM technology in their websites? Im just a bit confused still on this aa channels server runs on. PC & only uses apple & android clients & server runs on pc.
I think this is over for WNBC:
2023/04/26 08:38:09.536625 [ERR] Could not start stream for ANY ch6000 WNBC: TVE: Could not fetch playlist: tvenbcono-x.akamaized.net: get https://tvenbcono-x.akamaized.net/v1/master/8731b4a01f4c78c237c9c596da70a09cf1742ab7/PROD_NBC_OO_PASSTHROUGH/master.m3u8?aws.sessionId=f053effd-9adb-49c5-bea0-6e758b6fba4b&hdnts=exp=1682512809~acl=/v1/master/!/Content/~hmac=036bc9125b87804b207fc94a4c453f7c69bbe829047cb00c06eb72413e95af63: 504 Gateway Time-out
2023/04/26 08:38:09.537222 [ERR] Failed to start stream for ch4: M3U: 503 Service Unavailable
2023/04/26 08:38:09.630205 [HLS] Couldn't generate stream playlist for ch4-dANY-ip192.168.0.147: M3U: 503 Service Unavailable
2023/04/26 08:38:09.630306 [HLS] Stopping transcoder session ch4-dANY-ip192.168.0.147
Yep, I can confirm, as of this morning: my remaining NBU holdouts, KNBC and SyFy (East) are no longer working for me, either.
I lost SYFY as well.. that was my last “holdover”
WNBC good. SyFy bad.
Really? Not working for me since this morning when I noticed it.
I'm running Channels DVR version 2023.04.25.1552. What is yours?
WCAU also gone. That must be it for the NBC O&Os.
NBC was working for me up until this morning. Now it's gone as well.
WSMV (Nashville) is now dead too. Looks like today was the final day for most of the holdouts.
Does the Homerun cable card need to be on the same network as the channels server?
Well, it worked this morning. You jinxed it.
I guess the switch to DRM occurred this morning and you just happened to check before, and I checked after. We use the same TVE stream so it was just a matter of timing. 
Does the Homerun cable card need to be on the same network as the channels server?
No, they can reside on different networks (as long as the two can talk directly ie no firewalls, etc)
My local (WRC Washington DC) stopped working yesterday. As of last night it reappeared. Today it is working on my Channels apps for iPhone, iPad and AppleTV, but NOT on the server (ver.2023.04.25.1552). Rescan did not help.