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An illegal number is a number that represents information which is illegal to possess, utter, propagate, or otherwise transmit in some legal jurisdiction. Any piece of information is representable as a number; consequently, if communicating a specific set of information is illegal in some way, then the number may be illegal as well.〔(【引用サイトリンク】title=The Prime Glossary: illegal prime )〕 == Background == A number may represent some type of classified information or trade secret, legal to possess only by certain authorized persons. An AACS encryption key that came to prominence in May 2007 is an example of a number claimed to be a secret, and whose publication or inappropriate possession is claimed to be illegal in the United States. It allegedly assists in the decryption of any HD DVD or Blu-ray Disc released before this date. The issuers of a series of cease-and-desist letters claim that the key itself is therefore a copyright circumvention device, and that publishing the key violates Title 1 of the US Digital Millennium Copyright Act. In part of the DeCSS court order〔(Memorandum Order, in MPAA v. Reimerdes, Corley and Kazan (NY; Feb. 2, 2000) )〕 and in the AACS legal notices, the claimed protection for these numbers is based on their mere possession and the value or potential use of the numbers. This makes their status and legal issues surrounding their distribution quite distinct from that of mere copyright infringement.〔 Any image file or an executable program〔(【引用サイトリンク】title=Prime Curios: 48565...29443 (1401-digits) )〕 can be regarded as simply a very large binary number. In certain jurisdictions, there are images that are illegal to possess,〔(【引用サイトリンク】title=Criminal Justice Act 1988 + amendments )〕〔(Aniconism in Islam )〕〔(Jyllands-Posten Muhammad cartoons controversy#Aniconism )〕 due to obscenity or secrecy/classified status, so the corresponding numbers could be illegal.〔 In 2011 Sony sued George Hotz and members of fail0verflow for jailbreaking the PlayStation 3.〔(Sony follows up, officially sues Geohot and fail0verflow over PS3 jailbreak ). Nilay Patel, Engadget (2011-01-12). Retrieved on 2011-02-16.〕 Part of the lawsuit complaint was that they had published PS3 keys. Sony also threatened to sue anyone who distributed the keys.〔(【引用サイトリンク】title=Sony lawyers now targeting anyone who posts PlayStation 3 hack )〕 Sony later accidentally tweeted an older dongle key through its fictional Kevin Butler character.〔(【引用サイトリンク】title=PS3 'jailbreak code' retweeted by Sony's Kevin Butler )〕 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「Illegal number」の詳細全文を読む スポンサード リンク
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