zupt/LICENSE
Cristian Cezar Moisés 544a2cd647
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v4.0.0: codec 2.60.4 security release, --pq-box sealed-box mode, F-16 fix
Major release. Highlights:

- Codec: vendored VaptVupt codec moves to canonical 2.60.4 security
  release. Fixes a high-severity OOB heap write in the AVX2 decode fast
  path (reachable on a valid stream sized to exactly content_size, both
  tail variants). Brings CBMC-formally-verified BCJ filters with
  automatic ELF/PE/Mach-O detection. Compressed output stays
  byte-identical (ratio gate Δ 0.00%); wire format unchanged at v1.6.
- New --pq-box sealed-box recipient mode (vendored libpqvaptvupt 0.6.0):
  ML-KEM-768 + X25519 combined via HKDF-SHA256 with domain separation,
  AES-256-CTR + HMAC-SHA256 EtM. Legacy --pq and --pq-sdk stay readable.
- F-16: discloses and fixes a pre-existing data-loss defect in the
  <= 3.8.0 in-tree BCJ encoder. Full back-compat matrix decodes
  byte-exact under 4.0.0; every readable pre-4.0 archive remains readable.

Repository hygiene:
- Sync full 4.0.0 source tree (codec, crypto, SDK, GUI, packaging, tests).
- Remove internal scratch files (PROMPT.md, FORMAL_AUDIT_PROMPT.md)
  and superseded version-specific docs (INTEGRATION_PROTOCOL_2.60.4.md,
  docs/FINDINGS-2.x.md) and a stray test binary.
- Refresh README download/install section to real 4.0.0 release assets;
  bump version badge to 4.0.0.
- Add .gitignore for build outputs (keeps vendored prebuilt libraries).
2026-06-10 18:48:58 -03:00

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GNU AFFERO GENERAL PUBLIC LICENSE
Version 3, 19 November 2007
Copyright (C) 2026 Cristian Cezar Moisés <zupt@riseup.net>
VaptVupt (formerly Zupt; renamed in v3.0.0 due to a prior INPI Brasil
trademark registration of "Zupt" for unrelated software) is free
software: you can redistribute it and/or modify it under the terms of
the GNU Affero General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your
option) any later version.
VaptVupt 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public
License along with this program. If not, see:
https://www.gnu.org/licenses/agpl-3.0.txt
https://www.gnu.org/licenses/agpl-3.0.html
SPDX-License-Identifier: AGPL-3.0-or-later
─────────────────────────────────────────────────────────────────────
ABOUT THIS LICENSE
The GNU Affero General Public License v3 (AGPLv3) is a copyleft
license designed for software that may be run as a network service.
It is identical to the GNU General Public License v3, with one
additional requirement (Section 13): if you modify libzuptsdk and
make the modified version available to users over a computer network,
you must offer those users access to the corresponding modified
source code.
This protects Zupt against being adopted by SaaS providers as
a private fork without contributing back, while keeping it freely
usable by individuals, small businesses, and the broader open-source
community.
If you write a separate program that is distributed alongside
Zupt (for example, statically linking it into your own
application), the AGPL requires you to license that combined work
under the AGPL as well — which means you must publish the source.
If this is not acceptable for your use case, please contact the
author for commercial licensing options:
sac@securityops.co
https://git.securityops.co/cristiancmoises/zupt
─────────────────────────────────────────────────────────────────────
The full text of the GNU Affero General Public License version 3
should accompany this distribution as a separate file (or you may
download it from the URLs above). It is approximately 35 KB / 619
lines of plain text.
─────────────────────────────────────────────────────────────────────
NOTE ON VAPTVUPT (GPL, NOT AGPL)
The VaptVupt LZ + tANS codec, located in:
src/vv_*.c
src/vaptvupt_api.c
include/vaptvupt*.h
include/vv_*.h
is licensed under the GNU General Public License version 3 or later
(GPL-3.0-or-later), NOT the AGPL. This deliberate licensing choice is
made so that, with sufficient maturity, VaptVupt can be considered
for upstreaming into the Linux or BSD kernels (which require GPL-
compatible licensing).
The standalone repository for VaptVupt is at:
https://git.securityops.co/cristiancmoises/vaptvupt
The combination of GPL-licensed VaptVupt with AGPL-licensed Zupt is
explicitly intended by the author and consistent with the rights
retained by sole-authorship.
─────────────────────────────────────────────────────────────────────
COMMERCIAL LICENSING
Both AGPL and GPL components may be commercially relicensed by the
author. If you require relief from copyleft terms, contact:
sac@securityops.co