I have just followed from your edit exchange on the article BluRay Disc to find the exchange above  Sadly you appear to know little about the subject and to be fair it has become confusing because much of the terminology has become abused  First European BluRay discs are not produced in p format   That is almost exclusively the preserve of the American regions  Secondly the BluRay format does not support the proper  progressive high definition formats p and p and I include the p in that  This is because the data rate is not fast enough for these formats  The European sourced discs that state p on the packaging are discs produced from film originated material and is one of the abuses of the term progressive  The term progressive strictly defines a video format where the lines of video information are recorded in strict numerical order                    Alternatively there is the interlaced format which displays the odd lines ony first odd field and then follows them by the even lines even field You probably know this already                        They are actually stored in the digital video frame the other way around due to the digital video formats origins in the NTSC world  In true video source material the even field displays a time slice that is  milliseconds later than the odd field and the two together give a comlete video frame  This is also largely true in the Americas except the even field precedes the odd field by  miliiseconds  There is a largish group of enthusiasts if thats the right word who have become somewhat anally retentive over the progressive video formats and who have convinced themselves that progressive is the only way to go  The reality is that any improvement in the visual perception of the video is marginal at best and certainly not worth the doubling of the required digital data to support it  But for them everything has to be progressive  I shall coin the word progressivists for this discussion  When film originated material is transferred to video in Europe the film is run slightly fast by  which allows one film frame to occupy both the the odd and even fields of the video frame known as  pulldown  Thus the even field displays a time slice that is  milliseconds later than the odd field  In order to satisfy the progressivists the BluRay producers state that such material is in p format but using something called a Progressive Segmented Frame technique though they dont mention that last bit on the box  That is that it is progressive video but the odd lines have been recorded together and then they are followed by the even lines  It is really interlaced video but by the time the display device or the Bluray player has deinterlaced the video it doesnt matter one jot where it actually happens the result is perceptually indistinguishable from true p video assuming the deinterlacing algorithm works properly  If watched on a CRT display then of course the video will be interlaced as there is no deinterlacing prior to display but with that number of lines no one is likely to notice unless they sit inches away from the screen  The description p on the box is technically at least wrong but percetually the same as p video  The  speed up goes completely unnoticed especially these days when the sound is adjusted back to the original pitch  and obviously you hadnt noticed it yourself if you had convinced yourself that you were watching films at the original speed  Once we cross to the Americas different problems occur  Obviously running the film at  frames per second is not an option so instead film is converted to video by storing the same film frame on  half video frames followed by storing the next frame on  half video frames and then repeating         Thus  film frames occupy  video frames the technique is  pulldown  often wrongly called  pulldown  Properly deinterlaced such material is perfectly watchable and the viewer unlikely to feel anything is wrong  But the progressivists have decided that it is not the way to watch film material and have even invented faults to justify a move to a progressive format  I have even seen claims obviously failing to understand the technique that movement in the resultant video is uneven in that it jumps  further every other jump due to the  half fields    The result was the p format  The only problem with the p format is that if you try to watch it on a CRT display and A CRT is still unbeatable for contrast and colour reproduction the result will be unviewable to bad flicker  something that was known as long ago as  when television was broadcast in the  line  field progressive format known in those days by the more correct term of sequential    Because of its American origins European players and TV sets have not officially supported the format until relatively recently  Early equipment either didnt support it at all but if they did it was only because the internal circuitry was common to its American counterpart  Although p has become a selling point in the last year or so its usually prominent on the box it is of little value to Europeans because if they do import p BluRays from America practically all current output if not all current ouptut is region locked to Region A machines  Selling p discs in Europe would be risky because many are likely to be returned as unplayable on older equipment