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diff --git a/pdf/pdf_sec.h b/pdf/pdf_sec.h
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+++ b/pdf/pdf_sec.h
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+/* Copyright (C) 2020-2021 Artifex Software, Inc.
+   All Rights Reserved.
+
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied,
+   modified or distributed except as expressly authorized under the terms
+   of the license contained in the file LICENSE in this distribution.
+
+   Refer to licensing information at http://www.artifex.com or contact
+   Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
+   CA 94945, U.S.A., +1(415)492-9861, for further information.
+*/
+
+#ifndef PDF_SECURITY
+#define PDF_SECURITY
+
+int pdfi_compute_objkey(pdf_context *ctx, pdf_obj *obj, pdf_string **Key);
+int pdfi_decrypt_string(pdf_context *ctx, pdf_string *string);
+int pdfi_initialise_Decryption(pdf_context *ctx);
+
+#endif