I know one for sure … my Panasonic can record TV to hard drive and those recordings are either encrypted and/or in a Panasonic proprietary format and can only be watched on the Panasonic TV that recorded them.
LG is probably the same.
TV manufacturers have probably done this so people recording TV shows can’t then take those recordings and distribute them. ie. upload/share them.
The only thing i’ve found is No-name brand China Made DVR/PVR/Set top Boxes can record to a hard drive (typically FAT32 formatted) and in standard H.264/AVC which can then be played on Anything.