TiVo Corporation is an American technology company. The company holds over 6,000 pending and registered patents, the company also provides analytics and recommendation platforms for the video industry. In 2016, Rovi acquired digital video recorder maker TiVo Inc. Macrovision Corporation was established in 1983. The 1984 film The Cotton Club was the first video to be encoded with Macrovision technology when it was released in 1985, by the end of the 1980s, most major Hollywood studios were utilizing their services. John O. Ryan and William A. Krepick led the company through an IPO in 1997 priced at $9.00 a share. In July 2005, the company hired Alfred J. Amoroso as chief officer and president to succeed William A. Krepick. Macrovision acquired Gemstar-TV Guide on May 2,2008, in a deal worth about $2.8 billion. The combined company would seek to be “the homepage for the TV experience, the divestiture of the software business unit closed on April 1,2008, becoming Acresso Software. Macrovision also ultimately sold off parts of Gemstar-TV Guide not focused on entertainment, including TryMedia, eMeta, TV Guide Magazine, TV Guide Network. The company also bought two companies providing entertainment metadata, All Media Guide on November 6,2007, and substantially all the assets of Muze, on July 16,2009, Macrovision Solution Corporation announced the official change of its name to Rovi Corporation. Rovi announced its first product on January 7,2010 – TotalGuide, on March 16,2010, Rovi acquired MediaUnbound for an undisclosed amount. MediaUnbound had helped build static and dynamic personalization and recommendation engines for such as Napster, eMusic. On June 16,2010, the announced the Rovi Advertising Network which bundled guide advertising. On December 23,2010, the announced its intention to acquire Sonic Solutions. Sonic provided digital video processing, playback and distribution technologies and owned RoxioNow an OTT technology provider, on March 1,2011, Rovi announced its acquisition of online video guide SideReel. The company announced Amorosos intention to retire on May 26,2011, tom Carson, formerly the executive vice president of sales and marketing, was appointed CEO and President in December 2011. Continuing on this path, the made a similar announcement in January 2014 indicating its intent to sell the DivX. On April 1,2013, Rovi acquired Integral Reach, a provider of predictive analysis services, the technology would be integrated into Rovis audience analysis services
Macrovision pulses in an otherwise unused video line. Here they are large, forcing a VCR's auto contrast circuit to make the picture darker.
A couple of seconds later, the pulses have reduced in amplitude, forcing a VCR's auto contrast circuit to make the picture lighter. A couple of seconds later still, the pulses return to their original amplitude, darkening the picture once more.