extended. 91 releasegroups have signed the rules. as with the 2005 standards, there is a rebuttal that aims to allow "SOME of the fuckups and insanity in the 2009 ruleset". While the 2005 rebuttal made some valid points, this one is regarded as being pointless by other sceners. The reason for lowering the resolution is that some cheap Xvid players don't fully support resolutions above 640px. The pixel aspect ratio goes bad and makes the movie unwatchable. Other points made in the rebuttal are too hard to enforce, while still being backed by the releasing groups, or that the TXD is mainly meant for retail sources. Not all rules can be enforced on non-retail sources. DivX and Xvid for television sources XviD used for standard definition English television releases has been a ruleless world. However, in 2002 a ruleset for VCD, SVCD and DivX/Xvid tries to cover up the mess a little. SDTV, PDTV, HDTV and their dupe rules were being defined. Nuking had always been an issue in the TV scene. In 2007, a document was released that "intended to bring a level playing field to the TV-XviD scene and attempt to put down some rules to end some of the controversy that has plagued us in recent years", but it was only a draft. On January 1, 2011, a rule set written specifically for UK TV was released, taking into consideration various factors which differ from other regions. The introduction of HDTV and the availability of high-definition source material has resulted in the release of video files that exceed the maximum allowed resolution by the TDX rules, which anticipated DVD-Video rips as the ultimate source. Due to a missing standard these releases follow different rules. They are usually tagged as HR HDTV and use half the resolution of 1080i (960 × 540 px, vertically cropped to 528 or 544 px). Some releases also use a resolution of 1024 × 576 px to provide a proper aspect ratio of 16:9. Occasionally, shows (usually animated shows) aired in standard definition (PDTV) are often uploaded as HR (high resolution) PDTV using the H264 codec which offers much better compression than XviD, allowing a higher resolution in a file the same size as an XviD encoded video using a standard definition source. x264 for retail sources On October 17, 2013, the first standard definition ruleset for retail sources was released. A day