Additionally license under Apache License version 2.0

The Apache License version 2.0 is now the primary license for qpdf.
However, users may, at their option, continue to use Artistic version
2.0.

1 files changed, 18 insertions, 4 deletions

diff --git a/include/qpdf/Pl_DCT.hh b/include/qpdf/Pl_DCT.hh
index f9f6dbf4..bbdd2f58 100644
--- a/include/qpdf/Pl_DCT.hh
+++ b/include/qpdf/Pl_DCT.hh
@@ -1,9 +1,23 @@
 // Copyright (c) 2005-2017 Jay Berkenbilt
 //
-// This file is part of qpdf.  This software may be distributed under
-// the terms of version 2 of the Artistic License which may be found
-// in the source distribution.  It is provided "as is" without express
-// or implied warranty.
+// This file is part of qpdf.
+//
+// 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
+//
+//   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.
+//
+// Versions of qpdf prior to version 7 were released under the terms
+// of version 2.0 of the Artistic License. At your option, you may
+// continue to consider qpdf to be licensed under those terms. Please
+// see the manual for additional information.
 
 #ifndef __PL_DCT_HH__
 #define __PL_DCT_HH__