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1.3.1: relicense to MIT (clean-room CSS + drop copyleft-lib references)

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Relicensed from AGPL-3.0 to MIT, effective 1.3.1 (<=1.3.0 remain AGPL). The CSS
content cipher and Stevenson title-key attack are attributed to their published
cryptanalysis (not libdvdcss); all libaacs/libbluray/libdvdread/libdvdnav name
references were dropped from comments while keeping the standard format/spec
descriptions. Also bumps to 1.3.1.
This commit is contained in:
Matthew Jackson
2026-07-10 12:31:19 -07:00
parent 24e2bc33cf
commit b8f0af9ef5
22 changed files with 267 additions and 272 deletions
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src/ifo.rs
+8 -8
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@@ -58,7 +58,7 @@ pub struct DvdTitle {
pub struct DvdCell {
pub first_sector: u32,
pub last_sector: u32,
/// Raw cell-category byte at `cell_playback + 0` (libdvdread layout).
/// Raw cell-category byte at `cell_playback + 0` (DVD-Video IFO layout).
/// Packs block_mode (bits 7-6), block_type (bits 5-4), seamless_play
/// (bit 3), interleaved (bit 2), stc_discontinuity (bit 1),
/// seamless_angle (bit 0). Carried so the extent builder can recognise
@@ -72,7 +72,7 @@ pub struct DvdCell {
}
/// Decoded view of a cell-category byte (`cell_playback + 0`), per the
/// DVD-Video spec / libdvdread `cell_playback_t` layout. Byte-0 bitfields,
/// DVD-Video IFO cell-playback layout. Byte-0 bitfields,
/// MSB-first: `block_mode`(7-6), `block_type`(5-4), `seamless_play`(3),
/// `interleaved`(2), `stc_discontinuity`(1), `seamless_angle`(0). (The real
/// `cell_type` is a karaoke-only field in byte 1, not used here.)
@@ -93,7 +93,7 @@ pub struct CellCategory {
}
impl CellCategory {
/// Decode the raw `cell_playback + 0` byte (libdvdread `read_cell_playback`).
/// Decode the raw `cell_playback + 0` byte (DVD-Video IFO cell playback).
pub fn decode(raw: u8) -> Self {
CellCategory {
block_mode: (raw >> 6) & 0x03,
@@ -423,7 +423,7 @@ fn parse_vts(
}
// VTSI_MAT (VTS_xx_0.IFO header) field offsets — fixed by the DVD-Video
// spec (libdvdread `vtsi_mat_t`). The offsets are constant; the sector
// spec (the VTSI management table). The offsets are constant; the sector
// values they point to are per-disc.
const VTSTT_VOBS_OFFSET: usize = 0xC4; // VTS title VOBS start sector (feature)
const VTS_PGCIT_OFFSET: usize = 0xCC; // VTS_PGCIT sector pointer
@@ -580,7 +580,7 @@ fn parse_audio_attr(data: &[u8], offset: usize) -> Result<DvdAudioAttr> {
_ => Codec::Unknown(coding_mode),
};
let sample_rate_flag = (b1 >> 4) & 0x03; // sample_frequency: byte 1 bits 5-4 (libdvdread audio_attr_t)
let sample_rate_flag = (b1 >> 4) & 0x03; // sample_frequency: byte 1 bits 5-4 (DVD-Video audio attributes)
let sample_rate = match sample_rate_flag {
0 => 48000,
1 => 96000,
@@ -1071,7 +1071,7 @@ mod tests {
/// reads with — a co-edit of constant + helper would silently re-introduce
/// the PAL-as-NTSC bug and every test would still pass. This test feeds
/// `parse_video_attr` HARDCODED bytes captured from real DVD-Video layouts
/// (DVD spec / libdvdread `video_attr_t`: mpeg_version[7-6] video_format[5-4]
/// (DVD-Video video attributes: mpeg_version[7-6] video_format[5-4]
/// display_aspect[3-2] permitted_df[1-0]) — no `v_atr_byte`. If the parser's
/// bit positions drift, these fail.
#[test]
@@ -1238,7 +1238,7 @@ mod tests {
// ─────────────────────────────────────────────────────────────────────
// Added hardening tests. Grounded in the DVD-Video IFO spec
// (dvd_udf / libdvdread ifo_types.h; http://dvd.sourceforge.net).
// (DVD-Video IFO format; http://dvd.sourceforge.net).
// ─────────────────────────────────────────────────────────────────────
/// BCD frame-rate flag: bits 7-6 of byte[3]. 0b01 = 25fps (PAL),
@@ -1593,7 +1593,7 @@ mod tests {
}
}
/// CellCategory decodes the libdvdread byte-0 bitfields: block_mode (7-6),
/// CellCategory decodes the DVD-Video cell-category byte-0 bitfields: block_mode (7-6),
/// block_type (5-4), seamless_play (3), interleaved (2),
/// stc_discontinuity (1), seamless_angle (0).
#[test]