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diff --git a/include/sane/sanei_auth.h b/include/sane/sanei_auth.h
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+/* sane - Scanner Access Now Easy.
+   Copyright (C) 2000 Jochen Eisinger <jochen.eisinger@gmx.net>
+   This file is part of the SANE package.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice. 
+*/
+
+/** @file sanei_auth.h
+ * Interface for authorization of resources
+ *
+ * This file implements an interface for user authorization. The authorization
+ * call is forwarded to the frontend which asks for a username and password.
+ * An MD5 digest is used if supported by the frontend.
+ *
+ * @sa sanei.h sanei_backend.h
+ */
+
+#ifndef sanei_auth_h
+#define sanei_auth_h
+
+#include "../include/sane/sane.h"
+
+/** Check authorization for a resource
+ *
+ * This function looks for the file SANE_CONFIG_DIR/backend.users.
+ * If this file doesn't exist, sanei_authorize always returns SANE_STATUS_GOOD.
+ * The file backend.users contains a list of usernames, passwords, and
+ * resources:
+ *
+ * username:password:resource
+ * username:password:resource
+ *
+ * If the requested resource isn't listed in this file, sanei_authorize
+ * return SANE_SATUS_GOOD. In all other cases, sanei_authorize sends a
+ * challenge to the frontend of the form
+ * 
+ * resource$MD5$randomstring
+ * 
+ * where randomstring consists of the PID, the time, and some random
+ * characters. It accepts two forms of answers
+ *
+ * std: username:password
+ * md5: username:$MD5$m5digest
+ *
+ * where md5digest is md5(randomstring password).
+ * 
+ * If this username/password/resource triple is listed in backend.users
+ * sanei_authorize returns SANE_STATUS_GOOD, in all other cases it returns
+ * SANE_STATUS_ACCESS_DENIED.
+ *
+ * @param resource resource to authorize
+ * @param backend backend name
+ * @param authorize auth callback
+ *
+ * @return
+ * - SANE_STATUS_GOOD - access is granted
+ * - SANE_STATUS_ACCESS_DENIED - access is denied
+ */
+
+SANE_Status
+sanei_authorize (const char *resource,
+		 const char *backend, SANE_Auth_Callback authorize);
+
+#endif /* sanei_auth_h */