Many large cities also have television stations that broadcast programming in various Asian languages such as KTSF in San Francisco and KYAZ in Houston , especially after the digital television transition, which has allowed some smaller stations in areas with heavy populations of Asian immigrants and American natives of Asian origin fluent in one of that continent's indigenous languages to carry such programming either as primary channel or subchannel affiliations. In , Spin redesigned the logo to feature in a single square which sat on the right-hand side of the screen, whilst various stripes would move along from left to right, often lighting the squared "4" up. In , Channel 4 commissioned Tomato Films to revamp the "4", which resulted in the "Circles" idents showing four white circles forming up transparently over various scenes, with the "4" logo depicted in white in one of the circles. Although 4Talent Magazine is technically a newsstand title, a significant proportion of its readers are subscribers. The countdown now flips over from the top, right, bottom and left with each second, and ends with four coloured squares, three of which are aligned vertically to the left of the Channel 4 logo, with is contained inside the fourth box. It has risen to become the fifth highest-rated television network in the U. On 10 December , Channel 4 launched a high definition television simulcast of Channel 4 on Sky 's digital satellite platform, after Sky agreed to contribute toward the channel's satellite distribution costs. Both of these help fulfill stations' legal obligations, respectively to provide educational children's programs through a law passed in known as the Children's Television Act , which requires stations to carry a minimum of three hours of programs featuring content benefiting the educational needs of youth each week and public service programming. Despite the Republic of Ireland not being in the UK, Channel 4 has a dedicated variant broadcast on Sky Ireland which omits programmes for which broadcast rights are not held in Ireland. Ion differs from other commercial networks in that the majority of its stations are owned-and-operated by its parent company with very few affiliates, and it is distributed exclusively via cable and satellite in markets where the network does not have a local station; Ion was the last of the seven conventional English language commercial broadcast networks to expand into distribution via digital multicasting, having relied entirely on cable and satellite distribution in markets where it otherwise could not maintain a primary affiliation until , when it began accepting subchannel-only affiliates through deals with Telemundo Station Group and Media General. There have also been a few local stations that have broadcast programming in American Sign Language , accompanied by English closed captioning. The largest ownership group in terms of coverage of the U. This arrangement allowed the ITV companies to fulfil their obligation to provide schools programming, whilst allowing ITV itself to broadcast regular programmes complete with advertisements. An earlier Channel 4 documentary broadcast on 12 August , as part of the Equinox series, in which similar claims were made.