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Richard Matthew Stallman (born March 16, 1953), often shortened to rms,[1] is an American software freedom activist andcomputer programmer. In September 1983, he launched the GNU Project[2] to create a free Unix-like operating system, and has been the project's lead architect and organizer. With the launch of the GNU Project, he initiated the free software movement; in October 1985 he founded the Free Software Foundation. Stallman pioneered the concept of copyleft and he is the main author of several copyleft licenses including the GNU General Public License, the most widely used free software license.[3] Since the mid-1990s, Stallman has spent most of his time advocating for free software, as well as campaigning against both software patents and what he sees as excessive extension of copyright laws. Stallman has also developed a number of pieces of widely used software, including the original Emacs,[4] the GNU Compiler Collection,[5] the GNU Debugger,[6] and many tools in the GNU Coreutils[citation needed]. He co-founded the League for Programming Freedom in 1989. While a graduate student at MIT, Stallman published a paper on an AI truth maintenance system called dependency-directed backtracking with Gerald Jay Sussman.[12]This paper was an early work on the problem of intelligent backtracking in constraint satisfaction problems. As of 2003, the technique Stallman and Sussman introduced is still the most general and powerful form of intelligent backtracking.[13] The technique of constraint recording, wherein partial results of a search are recorded for later reuse, was also introduced in this paper.[13] As a hacker in MIT's AI laboratory, Stallman worked on software projects like TECO, Emacs, and the Lisp Machine Operating System. He would become an ardent critic of restricted computer access in the lab, which at that time was funded primarily by the Defense Advanced Research Projects Agency. When MIT's Laboratory for Computer Science (LCS) installed a password control system in 1977, Stallman found a way to decrypt the passwords and sent users messages containing their decoded password, with a suggestion to change it to the empty string (that is, no password) instead, to re-enable anonymous access to the systems. Around 20% of the users followed his advice at the time, although passwords ultimately prevailed. Stallman boasted of the success of his campaign for many years afterward. |
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204886788(½ð±Ò+50, ·ÒëEPI+1): лл 2011-04-23 00:25:36
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