that's an awfully old TV, and it's almost guaranteed to be HDMI 1.4 or even older. I can't say I'm surprised with an HDCP error on something so old. I've also seen colored screens with less than adequate HDMI cables, so they might have gone bad as well.
Dan
Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.