Open Source Licences

Vivid is built with the open source software below. These are the same notices and licence texts the app shows in Settings → About → Open Source Licences. Each build records the source commit it was made from in Settings → About, and Vivid’s complete source, build instructions and third-party notices are on GitHub.

Overview and provenance
Vivid · GPL 3.0
Vivid: Apple distribution permission · GPL 3.0 additional permission
Earlier Apache-licensed code · Apache 2.0
mpv 0.41.0 · LGPL 2.1 or later
FFmpeg 8.0.1 · LGPL 2.1 or later
libass 0.17.5 · ISC
FreeType 2.12.1 · FreeType License
FriBidi 1.0.12 · LGPL 2.1 or later
HarfBuzz 8.1.1 · MIT
libunibreak 6.1 · zlib
libplacebo 7.351.0 · LGPL 2.1 or later
fast_float 8.0.1 · MIT
glad 2.0.8 · CC0 / Apache 2.0
Vulkan-Headers · MIT
Little CMS 2.17 · MIT
libdovi 3.3.2 · MIT
Rust standard library 1.98.0 · MIT
MoltenVK 1.4.1 · Apache 2.0
SPIRV-Cross · Apache 2.0
SPIRV-Tools · Apache 2.0
SPIRV-Headers · MIT
cereal · BSD 3-Clause
shaderc 2025.5 · Apache 2.0
glslang · BSD, MIT, Apache 2.0 and others
dav1d 1.5.3 · BSD 2-Clause
uavs3d 1.2 · BSD 3-Clause
libbluray 1.4.0 · LGPL 2.1 or later
libudfread 1.2.0 · LGPL 2.1 or later
uchardet 0.0.8 · MPL 1.1, GPL 2.0 or LGPL 2.1
CollectionHStack · MIT
DifferenceKit 1.3.0 · Apache 2.0
ThumbHash decoder · MIT
Apache License 2.0
GNU General Public License 3.0
GNU Lesser General Public License 2.1

Overview and provenance

Vivid: Source Licence and Third-Party Libraries
===============================================

This overview records source provenance and dependency information for Vivid.
Settings > About > Open Source Licences lists every bundled third-party
component; each opens on its own page with its notice and full licence text.
A licence text that Vivid or several components use word for word (Apache
2.0, GPL 3.0 and LGPL 2.1) is stored once and listed under Licence texts;
the notices of the components that use it mark where it applies.
THIRD_PARTY_NOTICES.md in the source revision for this build lists every
component, version and source.

Vivid: GPL-3.0-only with the Apple distribution
permission, copyright 2026 blurbery and the respective contributors.
You may copy, modify and redistribute covered code under GPLv3. There is
no warranty except as required by applicable law. The full GPLv3 text and
Apple permission are included in this screen. Earlier Apache-2.0 grants
remain valid; their original licence text is also retained here.

Vivid attribution: GPLv3 section 7 additional terms

Vivid is developed and maintained by blurbery.

These terms accompany GPL-3.0-only under sections 7(b) and 7(c), effective for the licensing revision containing this notice. They apply only to copyrightable Vivid material for which blurbery holds copyright or has express authority to impose these terms. They do not assert ownership of third-party components or other contributors' work, or impose these terms on that work without the necessary authority.

Attribution and origin

Under section 7(b), when conveying covered material or a modified version containing it, preserve the following author attribution in that material's source notices:

This software includes material from Vivid, developed by blurbery.

This attribution refers only to the covered Vivid material, not to the whole of a recipient's project or independently authored additions. Its formatting and location within the source notices may change provided the attribution remains readable and associated with the covered material. No logo, promotional link, advertising credit or particular user-interface placement is required.

Under section 7(c), do not misrepresent the origin of the covered material. Modified versions must be marked in a reasonable manner as different from the original Vivid material. Recipients may use their own project names, identify their own maintainers and describe their changes. No prescribed fork name or exact modification statement is required. Attribution does not imply that blurbery maintains or endorses a derivative.

Licence and existing notices

These are attribution and origin conditions, not an additional permission. Removing an additional permission, such as the Apple distribution permission, does not by itself remove these conditions. Preserve notices referring to these terms as required by GPLv3 sections 4 and 5. These terms impose no conditions on private use or private modification beyond GPLv3 and do not restrict lawful modification, redistribution or commercial use.

The standard GPLv3 licence text (LICENSE) and Apple distribution permission (LICENSE-APPLE-EXCEPTION) remain unchanged. These terms do not retroactively change earlier grants, including earlier GPL or Apache-2.0 grants, or restrict independent reuse rights under third-party licences. Preserve applicable third-party notices; see Third-party libraries (THIRD_PARTY_NOTICES.md).

The separate brand policy (TRADEMARK.md) governs Vivid's name and logo. Factual attribution is distinct from adopting Vivid as another project's branding.

Paths in the attribution terms refer to the corresponding source revision
provided with this build.

Corresponding source and build instructions:
The first row of Open Source Licences, "Source for this build", gives
the exact source commit this build was made from and its GitHub link. That
revision contains the complete source, project specs, build instructions
and THIRD_PARTY_NOTICES.md. Lucid Engine's build pipeline and Vivid's
engine patches are in its engine/ folder, and the source link under
Lucid media engine below gives the exact commit the engine release was
built from.
Vivid's repository is https://github.com/blurbery/vivid
The Apple permission preserves source disclosure; it does not allow
closed-source covered derivatives. Apple system frameworks retain Apple's
terms.

Lucid media engine (iOS and tvOS)
Package: https://github.com/blurbery/lucid-engine/tree/53ebeac793f251df987a8d80b997e7fe8064d1b7
Lucid Engine 0.1.0 (tag v0.1.0), product LucidEngine. Its README and
NOTICE list every library with its version, upstream commit and
licence, and its LICENSES folder holds their texts. Package.swift
records every binary URL and SHA-256 checksum.
Vivid's engine pipeline built every library in it from upstream source:
mpv 0.41.0, FFmpeg 8.0.1, libass, dav1d, libdovi, FreeType, FriBidi,
HarfBuzz, libunibreak, Little CMS, shaderc, MoltenVK, libplacebo,
uavs3d, libbluray and uchardet. The one prebuilt part is the Rust
standard library inside libdovi, from the Rust project's pinned
rust-std archives (Rust 1.98.0).
Source: the pipeline, the pinned upstream sources (engine/pins.ini, by
URL, commit and SHA-256) and every patch are in engine/ at the commit
this release was built from:
https://github.com/blurbery/vivid/tree/fcb6782121e72c6ed755336be913c036f4679ddb/engine
mpv is built with -Dgpl=false and FFmpeg without --enable-gpl or
--enable-version3, so both are LGPL-2.1-or-later as built. FFmpeg uses
Apple's Secure Transport for HTTPS; there is no OpenSSL.
Each patch is licensed like the library it patches:
mpv: Vivid's patches, LGPL-2.1-or-later (patch 0001 is an unchanged
upstream mpv commit).
FFmpeg: Vivid's patches, LGPL-2.1-or-later.
libass: upstream commit 057a5334 and upstream pull request #951,
both unchanged, and Vivid's patch 0010, all ISC.
libdovi: Vivid's patch, MIT.
libbluray: Vivid's patch, LGPL-2.1-or-later.
uavs3d: Vivid's patch, BSD-3-Clause.
All of the libraries are static libraries linked into the app
executable.

This software is based in part on the work of the Independent JPEG Group.

ThumbHash decoder
Revision: a652ce6ed691242f459f468f0a8756cda3b90a82
License: MIT
Source: https://github.com/evanw/thumbhash/tree/a652ce6ed691242f459f468f0a8756cda3b90a82
Vivid includes an adapted copy of the reference Swift decode path with input
validation, cross-platform image creation, and a bounded asynchronous cache.

Apple tvOS media catalog sample
------------------------------

The tvOS movie and series detail presentation uses the fold-snapping
implementation and material-gradient pattern from Apple's 2024 media catalog sample.
Source: https://developer.apple.com/documentation/swiftui/creating-a-tvos-media-catalog-app-in-swiftui

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

CollectionHStack (tvOS Home rows)
Revision: 15baaaa759a0e252addae08431c79a49a25e4afc
Source: https://github.com/LePips/CollectionHStack/tree/15baaaa759a0e252addae08431c79a49a25e4afc
MIT, bundled in CollectionHStack-MIT.txt.

DifferenceKit (CollectionHStack dependency)
Version: 1.3.0, revision 073b9671ce2b9b5b96398611427a1f929927e428
Source: https://github.com/ra1028/DifferenceKit/tree/073b9671ce2b9b5b96398611427a1f929927e428
Apache 2.0, bundled in DifferenceKit-Apache-2.0.txt.

Vivid

GPL 3.0

[GNU General Public License 3.0: full text below]

Vivid: Apple distribution permission

GPL 3.0 additional permission

Vivid: GPLv3 Apple Distribution Permission
==========================================

Copyright 2026 blurbery and the respective contributors.
Effective for this licensing revision dated 12 September 2026.

Scope
-----
Vivid, as a whole, is licensed under the GNU General Public License,
version 3 only (GPL-3.0-only), reproduced unchanged in LICENSE,
with the additional permission below. This permission applies only to
material whose copyright holders have authorised it. Contributions to
Vivid's own code are accepted under GPL-3.0-only with this permission.
Separately identified third-party material retains its own licence.

Additional permission under GNU GPL version 3, section 7
-------------------------------------------------------
The copyright holders grant you permission to convey the covered work,
including modified versions, in object-code form through the Apple App
Store and Apple TestFlight, and to authorise Apple to reproduce, process,
sign, host and deliver that object code for those distribution services.

Solely for that distribution path, you may comply with Apple's applicable
Developer Program agreement, Apple Media Services usage rules, and
standard Licensed Application End User License Agreement, notwithstanding
GPLv3 sections 3, 6 and 10 to the extent those terms or platform controls:

* limit use of Apple's delivered binary to authorised Apple devices,
  accounts, Family Sharing or volume-purchasing arrangements;
* restrict transfer, redistribution or modification of that delivered
  binary through Apple's service;
* apply code signing, FairPlay or comparable platform integrity controls
  that prevent recipients from modifying, re-signing, installing or
  relinking that delivered binary through Apple's service.

This permission also permits linking the covered work with Apple's
proprietary platform libraries and frameworks supplied with its operating
systems or official SDKs, and conveying the resulting executable under
GPLv3 with this permission. It grants no rights in Apple's software and
requires no disclosure of Apple's proprietary source code.

Source-code rights are preserved
--------------------------------
This permission does not waive the obligation to provide the complete
Corresponding Source for the covered work, including all modifications,
under GPLv3. Each distributor must provide recipients a no-charge means
of obtaining the source matching the binary, together with the licence,
this permission where applicable, and the build and installation scripts
and instructions required by GPLv3. Source must be available when the
binary is conveyed and for the duration required by the applicable GPLv3
source-delivery option. A link to a changing development branch alone is
not sufficient to identify the source for a released binary.

Recipients retain their GPLv3 rights to obtain, study, modify, build and
redistribute the source and their own builds outside Apple's distribution
path. Apple's binary usage rules must not be imposed on those source
copies or independent builds. This permission does not authorise
closed-source derivatives or additional restrictions imposed by a
redistributor independently of Apple's distribution requirements.

Any relaxation of Installation Information requirements is limited to
Apple-controlled signing, distribution and device restrictions. It does
not excuse withholding build instructions or imposing an independent
technical lock on modified versions. This permission grants no access to
another developer's accounts, credentials, service entitlements or data.

As provided by GPLv3 section 7, a recipient may remove this additional
permission from their copy or modifications. A distributor cannot rely
on it for material whose copyright holders have not granted it.

Third-party and earlier-version rights
-------------------------------------
This permission does not change the licences of FFmpeg, FriBidi, other
libraries, Apple sample code, or third-party artwork and services.
All applicable notices and third-party source, replacement and relinking
rights must be preserved. See THIRD_PARTY_NOTICES.md and the bundled
OpenSourceLicenses resources for the component inventory.

Earlier Vivid code distributed under Apache-2.0 remains available under
those existing grants. This change does not revoke or narrow them. The
original Apache licence is retained in
iosApp/Resources/OpenSourceLicenses/Vivid-Apache-2.0.txt.
New GPL-covered contributions are not offered under Apache-2.0 by this
notice. The GPL licence for the combined work does not remove independent
reuse rights in its Apache-licensed or other permissive components.

Vivid's name and logos are governed separately by TRADEMARK.md. This
permission adds no ban on lawful forks or commercial use and grants no
trademark rights. GPLv3's warranty and liability provisions apply, subject
to rights that cannot be excluded under applicable law.

Earlier Apache-licensed code

Apache 2.0

[Apache License 2.0: full text below]

mpv

0.41.0 · LGPL 2.1 or later

Component: mpv (libmpv)
Version: 0.41.0 (tag v0.41.0, commit 41f6a645068483470267271e1d09966ca3b9f413)
Source: https://github.com/mpv-player/mpv/tree/41f6a645068483470267271e1d09966ca3b9f413
SPDX: LGPL-2.1-or-later (built with -Dgpl=false)
Note: Built from upstream source by Vivid's engine pipeline for Lucid Engine 0.1.0, with Vivid's engine patches (LGPL-2.1-or-later; patch 0001 is an unchanged upstream mpv commit). Pipeline and patches: https://github.com/blurbery/vivid/tree/fcb6782121e72c6ed755336be913c036f4679ddb/engine
Note: Copyright explains which parts of mpv are GPL-only; -Dgpl=false leaves them out, so the library is LGPL-2.1-or-later as built. Copyright also lists the per-file BSD/MIT/ISC exceptions.
================================================================================

--------------------------------------------------------------------------------
File: Copyright
https://github.com/mpv-player/mpv/blob/41f6a645068483470267271e1d09966ca3b9f413/Copyright
--------------------------------------------------------------------------------

mpv is a fork of mplayer2, which is a fork of MPlayer.

mpv as a whole is licensed under the GNU General Public License GPL version 2
or later (called GPLv2+ in this document, see LICENSE.GPL for full license
text) by default. The mpv program is licensed the GNU Lesser General Public
License LGPL version 2 or later (LGPLv2.1+ in this document, see LICENSE.LGPL
for full license text) if built without using any GPL only files.
The -Dgpl=false configure switch is provided as a convenience for excluding
the GPL only files listed below from the build process.

However, do note that the build system is provided "as is" and using the
-Dgpl=false configure switch does not in itself create a LGPLv2.1+ license
grant.

Additionally, some non-program parts, such as the documentation and some config
files listed below, are still built and licensed under their respective licenses
even when -Dgpl=false is used. Please consult GPLv2+ and LGPLv2.1+ license texts
for further details on how to distribute these files.

Most source files are LGPLv2.1+ or GPLv2+, but some files are available under
more liberal licenses, such as BSD, MIT, ISC, and possibly others. Look at the
copyright header of each source file, and grep the sources for "Copyright" if
you need to know details. C source files without Copyright notice are usually
licensed as LGPLv2.1+. Also see the list of files with specific licenses below
(not all files can have a standard license header).

All new contributions must be LGPLv2.1+ licensed. Using a more liberal license
compatible to LGPLv2.1+ is also ok.

Changes done to GPL code must come with the implicit/explicit agreement that the
project can relicense the changes to LGPLv2.1+ at a later point without asking
the contributor. This is a safeguard for making potential relicensing of
remaining GPL code to LGPLv2.1+ easier.

See DOCS/contribute.md for binding rules wrt. licensing for contributions.

For information about authors and contributors, consult the git log, which
contains the complete SVN and CVS history as well.

mpv can be built as LGPLv2.1+ without using any GPL only files. To add a
LGPL mode to mpv, MPlayer code had to be relicensed from GPLv2+ to LGPLv2.1+ by
asking the MPlayer authors for permission. Since permission could not be
obtained from everyone, LGPL mode disables the following features, some of them
quite central:
- Linux X11 video output
- BSD audio output via OSS
- NVIDIA/Linux hardware decoding (vdpau, although nvdec usually works)
- minor features: jack, DVD, CDDA, DVB, CACA, legacy direct3d VO
Some of these will be fixed in the future. The intended use for LGPL mode is
with libmpv, and currently it's not recommended to build mpv CLI in LGPL mode
at all.

The following files are still GPL only (-Dgpl=false disables them):

audio/out/ao_jack.c will stay GPL
audio/out/ao_oss.c will stay GPL
stream/dvb* must stay GPL
stream/stream_cdda.c unknown
stream/stream_dvb.* must stay GPL
stream/stream_dvdnav.c unknown
video/out/vo_caca.c unknown
video/out/vo_direct3d.c unknown
video/out/vo_vaapi.c probably impossible (some company's code)
video/out/vo_vdpau.c probably impossible (nVidia's code)
video/out/vo_x11.c probably impossible
video/out/vo_xv.c probably impossible
video/out/x11_common.* probably impossible
video/vdpau.c hard (GPL-only parts must be ifdefed)
video/vdpau.h unknown
video/vdpau_mixer.* actual code must be rewritten
DOCS/man/ GPLv2+
etc/mplayer-input.conf unknown license, probably GPLv2+
etc/mpv.desktop unknown license, probably GPLv2+
etc/restore-old-bindings.conf unknown license, probably GPLv2+

None of the cases listed above affect the final binary if it's built as
LGPL. Linked libraries still can affect the final license (for example if
FFmpeg was built as GPL).

--------------------------------------------------------------------------------
File: LICENSE.LGPL
https://github.com/mpv-player/mpv/blob/41f6a645068483470267271e1d09966ca3b9f413/LICENSE.LGPL
--------------------------------------------------------------------------------

GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999

Copyright (C) 1991, 1999 Free Software Foundation, Inc.
<https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.

[This is the first released version of the Lesser GPL. It also counts
as the successor of the GNU Library Public License, version 2, hence
the version number 2.1.]

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That's all there is to it!

FFmpeg

8.0.1 · LGPL 2.1 or later

Component: FFmpeg (libavcodec, libavdevice, libavfilter, libavformat, libavutil, libswresample, libswscale)
Version: 8.0.1 (tag n8.0.1, commit 894da5ca7d742e4429ffb2af534fcda0103ef593)
Source: https://github.com/FFmpeg/FFmpeg/tree/894da5ca7d742e4429ffb2af534fcda0103ef593
SPDX: LGPL-2.1-or-later (built without --enable-gpl, --enable-version3 or OpenSSL)
Note: Built from upstream source by Vivid's engine pipeline for Lucid Engine 0.1.0, with Vivid's engine patches (LGPL-2.1-or-later). Pipeline and patches: https://github.com/blurbery/vivid/tree/fcb6782121e72c6ed755336be913c036f4679ddb/engine
Note: HTTPS uses Apple's Secure Transport; no OpenSSL is included.
Note: LICENSE.md requires executables that include the IJG-derived DCT files to state in their documentation: this software is based in part on the work of the Independent JPEG Group. The three IJG notices follow the LGPL text.
================================================================================

--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------

# License

Most files in FFmpeg are under the GNU Lesser General Public License version 2.1
or later (LGPL v2.1+). Read the file `COPYING.LGPLv2.1` for details. Some other
files have MIT/X11/BSD-style licenses. In combination the LGPL v2.1+ applies to
FFmpeg.

Some optional parts of FFmpeg are licensed under the GNU General Public License
version 2 or later (GPL v2+). See the file `COPYING.GPLv2` for details. None of
these parts are used by default, you have to explicitly pass `--enable-gpl` to
configure to activate them. In this case, FFmpeg's license changes to GPL v2+.

Specifically, the GPL parts of FFmpeg are:

- optional x86 optimization in the files
- `libavcodec/x86/flac_dsp_gpl.asm`
- `libavcodec/x86/idct_mmx.c`
- `libavfilter/x86/vf_removegrain.asm`
- the following building and testing tools
- `compat/solaris/make_sunver.pl`
- `doc/t2h.pm`
- `doc/texi2pod.pl`
- `libswresample/tests/swresample.c`
- `tests/checkasm/*`
- `tests/tiny_ssim.c`
- the following filters in libavfilter:
- `signature_lookup.c`
- `vf_blackframe.c`
- `vf_boxblur.c`
- `vf_colormatrix.c`
- `vf_cover_rect.c`
- `vf_cropdetect.c`
- `vf_delogo.c`
- `vf_eq.c`
- `vf_find_rect.c`
- `vf_fspp.c`
- `vf_histeq.c`
- `vf_hqdn3d.c`
- `vf_kerndeint.c`
- `vf_lensfun.c` (GPL version 3 or later)
- `vf_mcdeint.c`
- `vf_mpdecimate.c`
- `vf_nnedi.c`
- `vf_owdenoise.c`
- `vf_perspective.c`
- `vf_phase.c`
- `vf_pp7.c`
- `vf_pullup.c`
- `vf_repeatfields.c`
- `vf_sab.c`
- `vf_signature.c`
- `vf_smartblur.c`
- `vf_spp.c`
- `vf_stereo3d.c`
- `vf_super2xsai.c`
- `vf_tinterlace.c`
- `vf_uspp.c`
- `vf_vaguedenoiser.c`
- `vsrc_mptestsrc.c`

Should you, for whatever reason, prefer to use version 3 of the (L)GPL, then
the configure parameter `--enable-version3` will activate this licensing option
for you. Read the file `COPYING.LGPLv3` or, if you have enabled GPL parts,
`COPYING.GPLv3` to learn the exact legal terms that apply in this case.

There are a handful of files under other licensing terms, namely:

* The files `libavcodec/jfdctfst.c`, `libavcodec/jfdctint_template.c` and
`libavcodec/jrevdct.c` are taken from libjpeg, see the top of the files for
licensing details. Specifically note that you must credit the IJG in the
documentation accompanying your program if you only distribute executables.
You must also indicate any changes including additions and deletions to
those three files in the documentation.
* `tests/reference.pnm` is under the expat license.

## External libraries

FFmpeg can be combined with a number of external libraries, which sometimes
affect the licensing of binaries resulting from the combination.

### Compatible libraries

The following libraries are under GPL version 2:
- avisynth
- frei0r
- libcdio
- libdavs2
- librubberband
- libvidstab
- libx264
- libx265
- libxavs
- libxavs2
- libxvid

When combining them with FFmpeg, FFmpeg needs to be licensed as GPL as well by
passing `--enable-gpl` to configure.

The following libraries are under LGPL version 3:
- gmp
- libaribb24
- liblensfun

When combining them with FFmpeg, use the configure option `--enable-version3` to
upgrade FFmpeg to the LGPL v3.

The VMAF, mbedTLS, RK MPI, OpenCORE and VisualOn libraries are under the Apache License
2.0. That license is incompatible with the LGPL v2.1 and the GPL v2, but not with
version 3 of those licenses. So to combine these libraries with FFmpeg, the
license version needs to be upgraded by passing `--enable-version3` to configure.

The smbclient library is under the GPL v3, to combine it with FFmpeg,
the options `--enable-gpl` and `--enable-version3` have to be passed to
configure to upgrade FFmpeg to the GPL v3.

### Incompatible libraries

There are certain libraries you can combine with FFmpeg whose licenses are not
compatible with the GPL and/or the LGPL. If you wish to enable these
libraries, even in circumstances that their license may be incompatible, pass
`--enable-nonfree` to configure. This will cause the resulting binary to be
unredistributable.

The Fraunhofer FDK AAC and OpenSSL libraries are under licenses which are
incompatible with the GPLv2 and v3. To the best of our knowledge, they are
compatible with the LGPL.

--------------------------------------------------------------------------------
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--------------------------------------------------------------------------------

GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999

Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.