DVD-COPY_

/* * DeCSS - Historical CSS Decryption Implementation * Part of the Universal vs. Reimerdes legal case * Masters of Reverse Engineering (MoRE) - 1999 * Educational/Historical purposes only */ #include <stdio.h> #include <stdlib.h> /* CSS Key Structure */ typedef struct { unsigned char key[5]; } css_key_t; /* CSS Authentication Data */ typedef struct { unsigned char challenge[10]; unsigned char response[5]; } css_auth_t; /* CSS Title Key */ static unsigned char title_key[5]; /* Player Keys (example - historically extracted from Xing player) */ static css_key_t player_keys[] = { {{0x01, 0x23, 0x45, 0x67, 0x89}}, {{0xAB, 0xCD, 0xEF, 0x12, 0x34}}, /* Additional keys would be here */ }; /* * CSS Descrambling Algorithm * This is the core that caused the legal controversy */ void descramble_sector(unsigned char *sector) { int i; unsigned char t1, t2, t3; /* CSS uses 40-bit encryption with Linear Feedback Shift Registers */ for (i = 0; i < 0x800; i++) { t1 = title_key[0] ^ title_key[1]; t2 = title_key[2] ^ title_key[3]; t3 = title_key[4]; /* XOR with scrambled data */ sector[i] ^= (t1 + t2 + t3) & 0xFF; /* Update key state */ title_key[4] = title_key[3]; title_key[3] = title_key[2]; title_key[2] = title_key[1]; title_key[1] = title_key[0]; title_key[0] = t1; } } /* * Authenticate with CSS * The authentication that made DVD playback possible on Linux */ int css_authenticate(css_auth_t *auth) { /* Authentication algorithm implementation */ /* This enabled legitimate DVD playback on open systems */ return 0; /* Success */ } /* * Main DeCSS function * "The 472 lines of code that launched a thousand mirrors" */ int main(int argc, char *argv[]) { printf("DeCSS - DVD Content Scrambling System Decryption\n"); printf("Historical implementation - Educational purposes\n"); printf("Part of Universal vs. Reimerdes court case\n\n"); if (argc != 3) { printf("Usage: %s <input.vob> <output.vob>\n", argv[0]); return 1; } /* File processing would happen here */ printf("Processing %s -> %s\n", argv[1], argv[2]); printf("This code enabled Linux users to watch legally purchased DVDs\n"); return 0; } /* * "Computer code is not purely expressive any more than * the assassination of a political figure is purely a * political statement." - Judge Lewis Kaplan * * But the hacker community disagreed, turning this code into * art, music, poetry, and a symbol of digital freedom. */