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http://www.ruby-lang.org/en/LICENSE.txt
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Ruby is copyrighted free software by Yukihiro Matsumoto <matz@netlab.co.jp>.
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You can redistribute it and/or modify it under either the terms of the GPL
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(see COPYING.txt file), or the conditions below:
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1. You may make and give away verbatim copies of the source form of the
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software without restriction, provided that you duplicate all of the
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original copyright notices and associated disclaimers.
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2. You may modify your copy of the software in any way, provided that
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you do at least ONE of the following:
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a) place your modifications in the Public Domain or otherwise
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make them Freely Available, such as by posting said
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modifications to Usenet or an equivalent medium, or by allowing
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the author to include your modifications in the software.
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b) use the modified software only within your corporation or
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organization.
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c) rename any non-standard executables so the names do not conflict
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with standard executables, which must also be provided.
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d) make other distribution arrangements with the author.
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3. You may distribute the software in object code or executable
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form, provided that you do at least ONE of the following:
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a) distribute the executables and library files of the software,
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together with instructions (in the manual page or equivalent)
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on where to get the original distribution.
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b) accompany the distribution with the machine-readable source of
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the software.
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c) give non-standard executables non-standard names, with
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instructions on where to get the original software distribution.
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d) make other distribution arrangements with the author.
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4. You may modify and include the part of the software into any other
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software (possibly commercial). But some files in the distribution
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are not written by the author, so that they are not under this terms.
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They are gc.c(partly), utils.c(partly), regex.[ch], st.[ch] and some
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files under the ./missing directory. See each file for the copying
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condition.
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5. The scripts and library files supplied as input to or produced as
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output from the software do not automatically fall under the
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copyright of the software, but belong to whomever generated them,
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and may be sold commercially, and may be aggregated with this
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software.
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6. THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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PURPOSE.
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