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diff --git a/src/css.h b/src/css.h
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+/*****************************************************************************
+ * css.h: Structures for DVD authentication and unscrambling
+ *****************************************************************************
+ * Copyright (C) 1999-2001 VideoLAN
+ *
+ * Author: Stéphane Borel <stef@via.ecp.fr>
+ *
+ * based on:
+ *  - css-auth by Derek Fawcus <derek@spider.com>
+ *  - DVD CSS ioctls example program by Andrew T. Veliath <andrewtv@usa.net>
+ *  - DeCSSPlus by Ethan Hawke
+ *  - The Divide and conquer attack by Frank A. Stevenson <frank@funcom.com>
+ *
+ * libdvdcss 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.
+ *
+ * libdvdcss 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 libdvdcss; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *****************************************************************************/
+
+#ifndef DVDCSS_CSS_H
+#define DVDCSS_CSS_H
+
+#include <stdint.h>
+
+#include "dvdcss/dvdcss.h"
+
+#define CACHE_FILENAME_LENGTH_STRING "10"
+
+#define DVD_KEY_SIZE 5
+
+typedef uint8_t dvd_key[DVD_KEY_SIZE];
+
+typedef struct dvd_title
+{
+    int               i_startlb;
+    dvd_key           p_key;
+    struct dvd_title *p_next;
+} dvd_title;
+
+typedef struct css
+{
+    int             i_agid;      /* Current Authentication Grant ID. */
+    dvd_key         p_bus_key;   /* Current session key. */
+    dvd_key         p_disc_key;  /* This DVD disc's key. */
+    dvd_key         p_title_key; /* Current title key. */
+} css;
+
+/*****************************************************************************
+ * Prototypes in css.c
+ *****************************************************************************/
+int dvdcss_test       ( dvdcss_t );
+int dvdcss_title      ( dvdcss_t, int );
+int dvdcss_disckey    ( dvdcss_t );
+int dvdcss_unscramble ( uint8_t *, uint8_t * );
+
+#endif /* DVDCSS_CSS_H */