4K (computer virus)
4k is a computer virus which infects COM files and EXE files. The virus was one of the first to employ stealth tactics. Infected systems will hang, after September 22 every year, which is also the date of birth Bilbo Baggins, a character from "The Lord of the Rings". The code was intended to display the message "Frodo Lives", but hangs in all known variants.
Home cinema
By the mid-2010s, the Blu-ray Disc medium had become a common home media standard, and online video streaming sources such as Netflix and YouTube were offering a range of high definition content, including some 4K content (although various compression technologies are applied to make this streamed content feasible). The first 4K Blu-ray discs were released in 2016. By this point, 4K TVs and computer monitors were rapidly declining in price and increasing in prevalence, despite a lack of native 4K content. While many DSP systems existed, DTS-HD Master Audio remained the studio standard for lossless surround sound encoding on Blu-ray, with five or seven native discrete channels. High definition video projectors also continued to improve and decrease in price, relative to performance.