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VP8 is a video compression format owned by Google and created by On2 Technologies as a successor to VP7. In May 2010, after the purchase of On2 Technologies, Google provided an irrevocable patent promise on its patents for implementing the VP8 format, and released a specification of the format under the Creative Commons Attribution 3.0 license.〔(VP8 Bitstream Specification License )〕 That same year, Google also released libvpx, the reference implementation of VP8, under a BSD license.〔(【引用サイトリンク】title=Changes to the WebM Open Source License )〕 VP8 is currently supported by Opera, Firefox, Chrome, and Chromium. == History == VP8 was first released by On2 Technologies on September 13, 2008, as On2 TrueMotion VP8, replacing its predecessor, VP7. After Google acquired On2 in February 2010, calls for Google to release the VP8 source code were made. Most notably, the Free Software Foundation issued an open letter on March 12, 2010, asking Google to gradually replace the usage of Adobe Flash Player and H.264 on YouTube with a mixture of HTML5 and a freed VP8. On May 19, 2010, at its Google I/O conference, Google released the VP8 codec software under a BSD-like license and the VP8 bitstream format specification under an irrevocable free patent license.〔(【引用サイトリンク】title=Additional IP Rights Grant (Patents) )〕〔http://www.webmproject.org/license/〕 This made VP8 the second product from On2 Technologies to be opened, following their donation of the VP3 codec in 2002 to the Xiph.Org Foundation,〔The Free Library (2002-08-01) (On2 Signs Pact With Xiph.org to Develop/Support VP3 ), Retrieved on 2009-08-16〕 from which they derived the Theora codec. In June 2010, Google amended the VP8 codec software license to the 3-clause BSD license〔〔(【引用サイトリンク】title=Changes to the WebM Open Source License )〕 after some contention over whether the original license was actually open source. In February 2011, MPEG LA invited patent holders to identify patents that may be essential to VP8 in order to form a joint VP8 patent pool. As a result, in March the United States Department of Justice (DoJ) started an investigation into MPEG LA for its role in possibly attempting to stifle competition. In July 2011, MPEG LA announced that 12 patent holders had responded to its call to form a VP8 patent pool, without revealing the patents in question, and despite On2 having gone to great lengths to avoid such patents. In November 2011, the Internet Engineering Task Force published the informational RFC 6386, VP8 Data Format and Decoding Guide. In March 2013, MPEG LA announced that it had dropped its effort to form a VP8 patent pool after reaching an agreement with Google to license the patents that it alleges "may be essential" for VP8 implementation, and granted Google the right to sub-license these patents to any third-party user of VP8 or VP9. This deal has cleared the way for possible MPEG standardisation as its royalty-free internet video codec, after Google submitted VP8 to the MPEG committee in January 2013. In March 2013, Nokia asserted a patent claim against HTC and Google for the use of VP8 in Android in a German court;〔(【引用サイトリンク】title=Patent clouds remain over VP8: Google points to FRAND option, Nokia alleges infringement in court )〕 however, on August 5, 2013 the webm project announced that the German court has ruled that VP8 does not infringe Nokia's patent.〔(【引用サイトリンク】title=Good News from Germany )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「VP8」の詳細全文を読む スポンサード リンク
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