Yes. expr and derivatives are now LGPL. They were before but the main issue was the ambiguity caused by some leftover GPL license headers on some of the source files. This was fixed last year.

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Dan Wilcox
@danomatika
danomatika.com
robotcowboy.com

On Oct 14, 2015, at 3:35 PM, pd-list-request@lists.iem.at wrote:

From: Matt Barber <brbrofsvl@gmail.com>
Date: October 14, 2015 at 3:15:37 PM MDT
To: Jonathan Wilkes <jancsika@yahoo.com>
Cc: IOhannes m zmoelnig <zmoelnig@iem.at>, Pd-List <pd-list@lists.iem.at>
Subject: Re: [PD] prevent console error messages


I think error is in the log library.

Did the license issue with expr ever get sorted?