Sorry the preview/review links to old threads are broken at the moment (domain update messed a lot of things up) - but for DCH there are two legit covers of the DVD out - check these threads out;
http://www.zulm.net/forum/showthread.php?threadid=1591
and
http://www.zulm.net/forum/showthread.php?threadid=1683
...Spark Media/Spark Worldwide/Soven are all the same. They are two different covers of DCH DVD - both are the same in terms of quality, only covers are different.
As for KNPH, it’s really difficult to tell if its pirate or not – it sounds like ditto/replicated copy of the DEI version. The quality will be exactly the same as the original DEI two discs only that it’s not the authentic DEI product. It’s hard to tell really if it’s genuine or not. It could be it’s just the cover that’s been redone on the cheap for some reason or could be the whole DVD set is pirate set. You could try checking the bottom surface of the DVD discs – I’ve come across 3-4 genuine DEI KNPH DVDs and all have been with a gold bottom surface. Sometimes the ditto copies have a silver surface.
Ali