Ok, I have what is probably a simple question and I would just like to confirm before I start wasting gear slots.

If Damage reductions cap out at 50%:

For items like Defending Ring and Twilight Torque, that say "Damage Taken -5%", I understand this applies to both physical and magical damage.

Does that also apply to both physical and magical damage reduction caps? For example, say I have -45% PDT and I equip a Defending Ring on top of that. Does that bypass the cap and give me -55% or does it still apply and only give me -50%?