which are available in HD (namely Pro TV, Pro 2 and Pro X) display the channel logo in the top left but the HD watermark in the top right. Russia In Russia, television channels usually have watermarks, which are usually placed in the top-right or top-left corner of the screen (some notable exceptions are HTB, which places its logo on the bottom-left corner, and the Disney Channel which places its logo on the bottom-right corner). In some channels the watermark becomes half-transparent on ad breaks (it used to be removed on ad breaks, but not on trailers), but on main channels such as Channel One or Russia-1 they never disappear nor become half-transparent. Channel One was the first channel to have introduced their watermark in 1992 and by 1993 watermarks appeared on other channels. Serbia The Serbian national television RTS began showing logos in the early 1990s. Their logo was sometimes turned on manually during certain broadcasts but shortly afterwards remained permanently on-screen. One could notice how they were manually controlled, as the "logo-free" time during the begin of a program varied. Until around 1994–1995 their logos were opaque black and white, presumably due to being inserted into the analog CVBS signal just before being broadcast instead of an analog YUV, RGB or digital SDI signal, while in the mid-1990s they upgraded to colorized but still opaque logos. RTS's predecessor RTB (Radio Television of Belgrade) had DOGs of varying sizes, but rather than being introduced one after another they appear to have been used simultaneously at different broadcast sites. At least three different sizes and styles of their opaque black-and-white logo are known today. On the satellite channel "RTS-SAT", Latin letters were used, but after the destruction of RTS headquarters in 1999 during a NATO air strike, it could be noticed how the logo appeared to have been quickly re-drawn and was being inserted by different equipment as it varied in shape and size, presumably because of the original equipment used to insert it being destroyed. Today RTS has the same opaque color logo from 1999 on RTS-SAT and new translucent logos were introduced in the 2000s for the analog terrestrial programs. Old logos remain on most archived recordings presumably due to lack of a cleanfeed archiving policy in the past. Most local and regional stations and some national commercial broadcasters (Pink from 2001–present, as of September 2012, when the