1.8 license change?

Judging by the GitHub mirror, it looks like Ruby 1.8.x got its license
changed from (Ruby || GPL) to (Ruby || BSDL):

https://github.com/ruby/ruby/blob/trunk/COPYING

It starts with:

Ruby is copyrighted free software by Yukihiro M.
<[email protected]>.  You can redistribute it and/or modify it under
either the terms of the 2-clause BSDL (see the file BSDL), or the
conditions below:

It looks like this change was made in September last year. I checked
out
the source for the 1.8.7 branch from Subversion using this command,
which
I got from the ruby-lang.org site:

svn co http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_8_7

The COPYING file in the checkout still shows the original (Ruby || GPL)
text:

Ruby is copyrighted free software by Yukihiro M.
<[email protected]>.  You can redistribute it and/or modify it under
either the terms of the GPL version 2 (see the file GPL), or the
conditions below:

It looks like the COPYING file in that repository was last updated in
2007. What’s up with the discrepancy? Can I borrow code from MRI Ruby
for a BSD Licensed project of my own, or is the GitHub COPYING file in
error somehow? I hope someone here can enlighten me.

On Tue, May 03, 2011 at 07:29:58AM +0900, Chad P. wrote:

Judging by the GitHub mirror, it looks like Ruby 1.8.x got its license
changed from (Ruby || GPL) to (Ruby || BSDL):

https://github.com/ruby/ruby/blob/trunk/COPYING

I just realized I was looking at 1.9.3, and not 1.8.7 as I had thought.
Sorry about the noise.

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