diff --git a/gpl-lgpl.tex b/gpl-lgpl.tex
index 223cc7a..220e57c 100644
--- a/gpl-lgpl.tex
+++ b/gpl-lgpl.tex
@@ -479,8 +479,15 @@ available to subjugate users.  For example:
       Limit the Effect of Software Patents, Since We Can’t Eliminate Them}}
   for more information on the problems these patents present to society.}
 
-\item
-
+\item Digital Restrictions Management (usually called \defn{DRM}) is often
+  used to impose technological restrictions on users' ability to exercise
+  software freedom that they might otherwise be granted\footnote{See
+    \S~\ref{GPLv3s3} for more information on how GPL deals with this issue.}.
+  The simplest (and perhaps oldest) form of DRM, of course, is separating
+  software source code (read by humans), from their compiled binaries (read
+  only by computers).  Furthermore,
+  \href{http://www.law.cornell.edu/uscode/text/17/1201}{17 USC 1201} often
+  prohibits users legally from circumventing some of these DRM systems.
 
 
 \subsection{Non-USA Copyright Regimes}
@@ -1872,7 +1879,7 @@ So end the terms and conditions of the GNU General Public License.
 \section{GPLv3 \S 2: Basic Permissions}
 
 \section{GPLv3 \S 3: What Hath DMCA Wrought}
-
+\label{GPLv3s3}
 \section{GPLv3 \S 4: Verbatim Copying}
 
 \section{GPLv3 \S 5: Modified Source}