COPYING

.. SPDX-License-Identifier: CC-BY-SA-4.0

==========
 Licenses
==========

TL;DR summary: The Neo uGuzzi IPA core is covered by the LGPL-2.1-or-later license.
It dynamically links with a closed-source library, the uGuzzi, that offers
camera 3A processing services.

Licenses are expressed through SPDX tags in text-based files that support
comments. A copy of all licenses is stored in the LICENSES directory.

The following text summarizes the licenses covering the different components of
the project to offer a quick overview for developers. The SPDX  information is
however authoritative and shall prevail in case of inconsistencies with the text below.

The Neo uGuzzi IPA core source code, located in:
- src/ directory
- live_control/ directory
- utils/ directory
is fully covered by the LGPL-2.1-or-later license.
Other files located in those directories, most notably the meson build files,
may be covered by different licenses. None of their source code
is incorporated in the neo-ipa-uguzzi.so binary, they thus don't affect the
distribution terms of the binary.
The project provides testing services, located in the tests/ directory and is also
covered by the LGPL-2.1-or-later license.

The camera helper code, located in cam_helper/, is covered by The LGPL-2.1-or-later
license, except the md_parser.h, that is covered by the BSD-2-Clause license.

The ISP controller API is defined in header files located in include/isp/ and is
covered by the MIT license.

Copies of libcamera base API headers are located in include/libcamera/ and
are covered by the LGPL-2.1-or-later license.

Copies of libcamera utility scripts are located in scripts/libcamera/ and
are covered by the GPL-2.0-or-later license.

Neo uGuzzi IPA is built on top of services provided by two closed-source libraries,
the uGuzzi libraries, that are delivered as pre-built binaries.
These binaries, located in the libs/ directory are covered by
LICENSES/LA_OPT_NXP_Software_License.txt
uGuzzi libraries APIs are defined in headers located in:
- inc/uguzzi/
- inc/uguzzi_connect/
directories, and are covered by the same license.
uGuzzi librairies operate with camera tuning files to perform the required processing
on each frame received from the camera sensor. Camera tuning files are stored in the
data/ folder and are covered by the same license as the uGuzzi libraries.

Neo uGuzzi IPA also uses a helper class that allows retrieving binary data
from a file. This code, located in dtp_utils/, is covered by the Apache-2.0 license and
is derived from the BinaryData class implementation from libcamera IPU3 project hosted on
https://git.libcamera.org/libcamera/ipu3-ipa.git/.

Finally, copies of various Linux kernel headers are included in inc/linux/
to avoid depending on particular versions of those headers being installed in
the system. The Linux kernel headers are covered by their respective license,
including the Linux kernel license syscall exception. Using a copy of those
headers doesn't affect libcamera licensing terms in any way compared to using
the same headers installed in the system from kernel headers packages provided
by Linux distributions.