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www/philosophy categories.html

From: Richard M. Stallman
Subject: www/philosophy categories.html
Date: Mon, 03 Dec 2007 02:10:43 +0000

CVSROOT:        /webcvs/www
Module name:    www
Changes by:     Richard M. Stallman <rms>       07/12/03 02:10:43

Modified files:
        philosophy     : categories.html 

Log message:
        In definition of copyleft, recognize that some safe added requirements
        can be allowed, and that there are other threats to block.


Index: categories.html
RCS file: /webcvs/www/www/philosophy/categories.html,v
retrieving revision 1.45
retrieving revision 1.46
diff -u -b -r1.45 -r1.46
--- categories.html     2 Dec 2007 19:48:48 -0000       1.45
+++ categories.html     3 Dec 2007 02:10:37 -0000       1.46
@@ -126,10 +126,15 @@
 <dt id="CopyleftedSoftware"><strong>Copylefted software</strong></dt>
-       <dd>Copylefted software is free software whose distribution terms
-       do not let redistributors add any additional restrictions when they
-       redistribute or modify the software. This means that every copy of
-       the software, even if it has been modified, must be free software.
+       <dd>Copylefted software is free software whose distribution
+       terms ensure that all copies of all versions are free
+       software.  This means, for instance, that copyleft licenses
+       generally disallow others to add additional requirements to
+       the software (though a limited set of safe added requirements
+       can be allowed) and require making source code available.
+       Some copyleft licenses, such as GPL version 3, block other
+       means of turning software proprietary.
        <p>In the GNU Project, we copyleft almost all the software we
        write, because our goal is to give <em>every</em> user the freedoms
        implied by the term &ldquo;free software.&rdquo; See <a href=
@@ -413,7 +418,7 @@
 <!-- timestamp start -->
-$Date: 2007/12/02 19:48:48 $
+$Date: 2007/12/03 02:10:37 $
 <!-- timestamp end -->

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