diff --git a/checkin_notes b/checkin_notes
index 72e02cf6f7..a8ae60bd34 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -6189,3 +6189,14 @@ David  5 Aug 2008
         ops/*.php
         inc/*.inc
         user/*.php
+
+David  5 Aug 2008
+    - added copyright and license info to some C files
+
+    client/
+        hostinfo_unix_test.C
+        sim.h
+        rrsim_test.C
+    lib/
+        msg_queue.h
+        procinfo_win.C
diff --git a/client/hostinfo_unix_test.C b/client/hostinfo_unix_test.C
index 2737a7da5d..d461d3c77b 100644
--- a/client/hostinfo_unix_test.C
+++ b/client/hostinfo_unix_test.C
@@ -1,3 +1,20 @@
+// This file is part of BOINC.
+// http://boinc.berkeley.edu
+// Copyright (C) 2008 University of California
+//
+// BOINC is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License
+// as published by the Free Software Foundation,
+// either version 3 of the License, or (at your option) any later version.
+//
+// BOINC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
+
 #include <stdio.h>
 #include <string.h>
 
diff --git a/client/rrsim_test.C b/client/rrsim_test.C
index 1833c4dc9b..318014312a 100644
--- a/client/rrsim_test.C
+++ b/client/rrsim_test.C
@@ -1,3 +1,20 @@
+// This file is part of BOINC.
+// http://boinc.berkeley.edu
+// Copyright (C) 2008 University of California
+//
+// BOINC is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License
+// as published by the Free Software Foundation,
+// either version 3 of the License, or (at your option) any later version.
+//
+// BOINC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
+
 // This is a test framework for the rr_simulation() function.
 // To use it:
 // - cut and paste the current code from cpu_sched.C (see below)
diff --git a/client/sim.h b/client/sim.h
index 11789d803c..f8b098ba6f 100644
--- a/client/sim.h
+++ b/client/sim.h
@@ -1,3 +1,20 @@
+// This file is part of BOINC.
+// http://boinc.berkeley.edu
+// Copyright (C) 2008 University of California
+//
+// BOINC is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License
+// as published by the Free Software Foundation,
+// either version 3 of the License, or (at your option) any later version.
+//
+// BOINC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
+//
 #include <vector>
 
 #include "app.h"
diff --git a/lib/msg_queue.h b/lib/msg_queue.h
index 299b63cbbc..5c54c895d1 100644
--- a/lib/msg_queue.h
+++ b/lib/msg_queue.h
@@ -1,3 +1,23 @@
+// This file is part of BOINC.
+// http://boinc.berkeley.edu
+// Copyright (C) 2008 University of California
+//
+// BOINC is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License
+// as published by the Free Software Foundation,
+// either version 3 of the License, or (at your option) any later version.
+//
+// BOINC is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+// See the GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifdef _MSG_QUEUE_
+#define _MSG_QUEUE_
+
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
@@ -12,3 +32,5 @@ extern int create_message_queue(key_t);
 extern int receive_message(key_t,void*,size_t,bool);
 extern int send_message(key_t,void*,size_t,bool);
 extern int destroy_message_queue(key_t);
+
+#endif
diff --git a/lib/procinfo_win.C b/lib/procinfo_win.C
index f4be60b4bb..3567ccccbd 100644
--- a/lib/procinfo_win.C
+++ b/lib/procinfo_win.C
@@ -1,3 +1,5 @@
+// much of this code is public-domain
+//
 #include "boinc_win.h"
 #include "error_numbers.h"
 #include "diagnostics_win.h"