Fix the permissions on the target.

main.go

@@ -93,7 +93,7 @@ func Copy(from string, to string) {
   if err != nil { log.Fatalf("%s: %v", from, err) }
   defer src.Close()
 
-  dst, err := os.OpenFile(to, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0700)
+  dst, err := os.OpenFile(to, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
   if err != nil { log.Fatalf("%s: %v", to, err) }
   defer dst.Close()