This is entirely legal as noted in the following article:

https://www.nexttv.com/news/carson-show-to-stream-on-shout-factory-tv

The Carson Entertainment Group will be making up to 5000 shows available.

Pluto TV is another place to find unusual relics online. It’s owned by CBS but gives away the programming for free. Some of it, like the Russian propaganda channel RT, is pretty uninteresting, but it does have a few gems.
 
There’s a channel that airs nothing but episodes of Mystery Science Theater 3000, another ShoutCast TV Factory offering with a plethora of old movies and shows, If you have a VPN and set it for the U.S., there’s even more available, including a TV Land sitcom channel with shows like “3rd Rock From The Sun,” “One Day At A Time” and “All In The Family.”

And there are some generic comedy stations, sports outlets, a biography channel, some sci fi choices, several movie stations, and two game show networks, including Buzzr, one of those digital subcarrier stations we don’t get here, but which carries classic game shows from the 60s and 70s.
 
And that’s only a small description of what’s on offer.
 
You can explore it all here, although to get everything, you’ll need a VPN set to the U.S.

Thanks Muffaraw Joe...Good laughs are hard to come by these days and the old Tonight Show segments are still classics!