diff --git a/gpl-lgpl.tex b/gpl-lgpl.tex
index 01a6351..491674d 100644
--- a/gpl-lgpl.tex
+++ b/gpl-lgpl.tex
@@ -4322,11 +4322,15 @@ versions, and those forks that exist remain freely available.
 
 A final common business model that is perhaps the most controversial is
 proprietary relicensing of a GPL'd code base. This is only an option for
-software in which a particular entity is the sole copyright holder or has
-unconditional relicensing permissions. As discussed earlier in this tutorial,
-a copyright holder is permitted under copyright law to license a software
-system under her copyright as many different ways as she likes to as many
-different parties as she wishes.
+software in which a particular entity holds exclusive rights to
+relicense\footnote{Entities typically hold exclusive relicensing rights
+  either by writing all the software under their own copyrights, collecting
+  copyright assignments from all contributors, or by otherwise demanding
+  unconditional relicensing permissions from all contributors via some legal
+  agreement}. As discussed earlier in this tutorial, a copyright holder is
+permitted under copyright law to license a software system under her
+copyright as many different ways as she likes to as many different parties as
+she wishes.
 
 Some companies use this to their
 financial advantage with regard to a GPL'd code base. The standard