global: Add SPDX tags and copyright header

Mathias should probably add his copyright headers to each file too.

1 files changed, 5 insertions, 0 deletions

diff --git a/send.go b/send.go
index 5c6b350..24c7f32 100644
--- a/send.go
+++ b/send.go
@@ -1,3 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (C) 2017-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
 package main
 
 import (