Add copyright notices

Only on the files where I have contributed in a significant way,
or the files I wrote myself.

1 files changed, 3 insertions, 11 deletions

diff --git a/iqk_mul_mat.cpp b/iqk_mul_mat.cpp
index 83ef6d5b..1dee6ef3 100644
--- a/iqk_mul_mat.cpp
+++ b/iqk_mul_mat.cpp
@@ -1,19 +1,11 @@
 // -*- mode:c++;indent-tabs-mode:nil;c-basic-offset:4;coding:utf-8 -*-
 // vi: set et ft=cpp fenc=utf-8 :vi
 //
-// Copyright 2024 Iwan Kawrakow
 //
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
+// Copyright (C) 2024 Iwan Kawrakow
+// MIT license
+// SPDX-License-Identifier: MIT
 //
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
 
 #if defined IQK_IMPLEMENT
 #undef IQK_IMPLEMENT