Making sure there's license text distributed for the Linden Lab logos that makes it clear

we still are enforcing our trademarks

doc/LICENSE-logos.txt

+Logos and trademarks
+==============
+
+"Second Life" and "Linden Lab" are registered trademarks of Linden
+Research, Inc.  Other trademarks include (but are not limited to): the
+names Linden and Linden Research, as well as the Linden Lab Hexagon
+Design and the Second Life Hand Design logos.
+
+Use of logos and trademarks are subject to the Linden Lab trademark
+policy, available at:
+
+http://secondlife.com/corporate/trademark/