The PoDs of the detachable cover mods are all perfect bound (there might be a couple saddle-stitched) - that's a dead giveaway. Some of the PoDs are awful scans, e.g. my
Pod of
D2 has a highlighted, stained and written on cover map.
The PoDs are great for table play, to preserve your originals. But they aren't great and hard to use (perfect binding for a shortish book). I've bought a few but stopped buying them because the scans were bad.
~throwi