Displaying documents and paperwork

I've heard different techniques about displaying paperwork and documents some say never display an original, make a copy of the document in question and then frame that and keep the original filed away but that can get awkward in make copies of larger sized documents and the likes and I've heard to use UV protectant glass not normal glass in frames. The key is to find a method of storing and preserving the items that will not allow them to fade, or be damaged by light as they age. Does anyone have any suggestions?