Folks, I just mentioned PS5 because of the announcement that their system uses a Zen 2 AMD processor, and that is coincidentally the same chip archtecture that I recently installed in my PC. I don't have experience with consoles and probably never will, because I don't play games. But it seems to me that the structure of such machines is quite similar to a PC, due to the interaction between CPU and GPU, operating system, etc. Of course, a console design is more akin to a standalone player than a PC, but comparisons can be made.
SGX, to the best of my knowledge, is included in the BIOS and needs to be enabled in an Intel driven motherboard, simply because it was designed by Intel to that effect in a Intel board as a software protection. The Intel CPU encrypts information on a small amount of memory so that it cannot be read withouy permission, but the CPU can only do so if it has a structure that supports SGX. By the way, I have read complaints over the Internet of bugs in the sofware and lack of, in this case, 4K BDV playback on afected BIOS/UEFI.
I understand that Cyberlink took advantage of the SGX scheme in order to allow 4K Blu-Ray playback. Due to the reported bugs I would not be surprised if they decided to ditch SGX. Anyway, assuming, for the sake of the argument, that PowerDVD can only playback commercial, protected media, by resorting to SGX and Kaby Lake, my PC would never be able to play those discs. This is exactly what happened before I replaced my CPU! This is is a fact, not especulation, I tried many times, with different movies. And that made me forget the playback of 4K discs for quite a while, and until now I had no hope that I could ever play a 4K Blu-Ray in my PC.
Protection schemes exist since the days of VHS, and yes, despite all the protests being made during the last decades. If you recall RPC-1 on a DVD-ROM drive you may also remember when AnyDVD was first used, and why Slysoft solved all our problems for DVD playback in the PC.