[ostree] doc/overview: Add a note about the GPL

[Colin Walters <walters src gnome org>]

commit 0e6091215564b8bda7d8e81066ebdce0a65e2f9e
Author: Colin Walters <walters verbum org>
Date:   Fri Aug 23 17:21:19 2013 -0400

    doc/overview: Add a note about the GPL

 doc/overview.xml |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/doc/overview.xml b/doc/overview.xml
index 7e53530..948f5c7 100644
--- a/doc/overview.xml
+++ b/doc/overview.xml
@@ -40,7 +40,11 @@
       <emphasis>complete</emphasis> (bootable) filesystem trees.  It
       has no built-in knowledge of how a given filesystem tree was
       generated or the origin of individual files, or dependencies,
-      descriptions of individual components.
+      descriptions of individual components.  This means that, for
+      example, if you are distributing software which is licensed
+      under the GNU General Public License, the burden lies with the
+      tool generating these filesystem trees to ensure sufficent
+      metadata is included for compliance.
     </para>
     <para>
       The OSTree core emphasizes replicating read-only OS trees via