I was always under the impression DTCP-IP was a copy protection protocol embedded in a signal by the broadcaster. Is this correct ?

I'm now told by Panasonic that its something that must be *IN* a divx file and if absent the file will not stream over DLNA.

"On checking with the engineer it appears that this inability to stream DivX content is related to content protection, specifically the DTCP-IP content protection system which is the type of content protection used when streaming content via DLNA.
In order for the product to gain DLNA certification, we have to adhere to certain rules, in this particular case, if DivX format content does not contain DTCP-IP, then that content cannot be streamed (this is why you can play the same file from USB, but not stream it).'

That sounds to me more the case when a digital video is recorded Off-Air, but the dixv files I have are not and mostly stream just fine (and onto Panasonic devices). They just would not stream to a particular model BluRay (BDT-110), (although .mkv or .mp4 files on the same LAN and in the same folder would, just not divx or avi).

Panasonic Tech support go on to say-

"To be perfectly frank, I am as surprised and as disappointed as you are, but the reality of the situation is that DivX files specifically cannot be streamed, they can only played back via USB, as much as I would like to, I can’t change this situation. I agree that it seems absurd that a DivX format file can be played via USB but not via DLNA, but it is what it is."

Reading the promo blurb in the Panasonic website (DM-BDT320)  you're told -

Enjoy multi content on your PC in a separate room.
Using DLNA technology, Blu-ray Disc™ players and home cinema systems can access files on a DLNA server-compliant PC* or high definition recorders (DIGA)**. By simply connecting to a home network (LAN), you can enjoy AVCHD, WMV, DivX, JPEG, MP3 and WMA on your PC

Isn't that false advertising ? How can they say it will, if it wont, and why give excuses for it not working when it (mostly) does ?

Any DLNA users got any thoughts? I'm tearing my hair out - and thought I was (slightly) tech-savvy!