That is all well and good, except it is a load of crap in the situations we are dealing with. I have a 177 prim building that I built 110% myself, EVERY texture, I hand crafted, ever script I wrote, and EVERY piece, except the root prim says "unknown". If you edit a single wall piece, which is essentially a block, it says unknown.
One of two things may be afoot.... 1... LL is so bunged up about IP rights they have clamped things down too tightly OR 2. They are trying to make things unmovable to other grids, IMO.