diff --git a/presentations/1hr-GPL/1hr-GPL.markdown b/presentations/1hr-GPL/1hr-GPL.markdown
index 7141994..23e1813 100644
--- a/presentations/1hr-GPL/1hr-GPL.markdown
+++ b/presentations/1hr-GPL/1hr-GPL.markdown
@@ -209,3 +209,47 @@
+ Technological considerations dictate necessity of more complex rules for
certain types of modifications.
+
+# GPLv2§2(a-b)
+
+
+[GPLv2§]2. You may modify your copy or copies of the Program or any
+portion of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1 above,
+provided that you also meet all of these conditions:
+
+
+a) You must cause the modified files to carry prominent notices stating
+that you changed the files and the date of any change.
+
+
+b) You must cause any work that you distribute or publish, that in
+whole or in part contains or is derived from the Program or any
+part thereof, to be licensed as a whole at no charge to all third
+parties under the terms of this License.
+
+
+
+# GPLv2§ 2 ¶ ante-penultimate & penultimate
+
+
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+
+
+