Streaming services usually discourage recording, especially since you're free to stream included titles over and over. Streaming is a rental service, usually..
It sounds like Playon mainly records OTA stuff and anything not OTA can't be viewed until it's no longer on whatever streaming service it was taken from.
Record and download streaming movies and shows from Netflix, Hulu, Amazon, The CW and more.
Record and download streaming videos as .MP4 files. No expiration date on downloads.
Well, from that site it looks like they argue it's fair use since you already paid to see the content and that does make sense, that plus embedding personal info in the file to keep people from uploading it I guess is enough to pass muster with the courts.
Yeah, it seems they are tiptoeing the ragged legal edge. But I have to say it would be nice to download a lot of the stuff I watch multiple times. Since I already have a media server, it's simple to make it available on my network.