4K resolution
As noted above, DCI 4K is 40962160, while 4K UHD is 38402160, producing a slight difference in aspect ratio rather than a significant difference in resolution. Traditional displays, such as LCD or OLED, are 3840 pixels across the screen, with each pixel being 1/3840th of the screen width. They do not overlap—if they did, they would suffer reduced detail. The diameter of each pixel is basically 1/3840th of the screen width or 1/2160th of the screen height - either gives the same size pixel. That 38402160 works out to 8.3 megapixels, the official resolution of 4K UHD (and therefore Blu-ray UHD discs).
Movie4k.to
Movie4k.to, was a user-contributed video directory for television programs and films. It is an aggregation-website acting as a search index for online videos. In May 2013, Movie2k.to was shut down by the Motion Picture Association of America (MPAA) due to copyright infringement concerns, but morphed into another shortly after. It primarily serves English and German-speaking areas. However, the site is also no longer accessible in the UK, Denmark, and customers of some ISPs in Austria due to ISPs blocking the site.