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systemd/LICENSES/README.md

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systemd Project Licensing

Main License

The systemd project uses single-line references to Unique License Identifiers as defined by the Linux Foundation's SPDX project (https://spdx.org/). The line in each individual source file identifies the license applicable to that file.

The current set of valid, predefined SPDX identifiers can be found on the SPDX License List at https://spdx.org/licenses/.

The 'LICENSES/' directory contains all the licenses used by the sources included in the systemd project source tree.

Unless otherwise noted, the systemd project sources are licensed under the terms and conditions of LGPL-2.1-or-later (GNU Lesser General Public License v2.1 or later).

Unless otherwise noted, compiled programs and all shared or static libraries include sources under LGPL-2.1-or-later along with more permissive licenses, and are effectively licensed LGPL-2.1-or-later. systemd-udevd and other udev helper programs also include sources under GPL-2.0-or-later, and are effectively licensed GPL-2.0-or-later.

New sources that cannot be distributed under LGPL-2.1-or-later will no longer be accepted for inclusion in the systemd project to maintain license uniformity.

Other Licenses

The following exceptions apply:

  • some sources under src/udev/ are licensed under GPL-2.0-or-later, so all udev programs (systemd-udevd, udevadm, and the udev builtins and test programs) are also distributed under GPL-2.0-or-later.
  • the header files contained in src/basic/linux/ and src/shared/linux/ are copied verbatim from the Linux kernel source tree and are licensed under GPL-2.0 WITH Linux-syscall-note and are used within the scope of the Linux-syscall-note exception provisions
  • the following sources are licensed under the LGPL-2.0-or-later license:
    • src/basic/utf8.c
    • src/shared/initreq.h
  • the src/shared/linux/bpf_insn.h header is copied from the Linux kernel source tree and is licensed under either BSD-2-Clause or GPL-2.0-only, and thus is included in the systemd build under the BSD-2-Clause license.
  • The src/basic/linux/wireguard.h header is copied from the Linux kernel source tree and is licensed under either MIT or GPL-2.0 WITH Linux-syscall-note, and thus is included in the systemd build under the MIT license.
  • the following sources are licensed under the MIT license (in case of our scripts, to facilitate copying and reuse of those helpers to other projects):
    • hwdb.d/parse_hwdb.py
    • src/basic/linux/batman_adv.h
    • src/basic/sparse-endian.h
    • tools/catalog-report.py
  • the following sources are licensed under the CC0-1.0 license:
    • src/basic/siphash24.c
    • src/basic/siphash24.h
  • the following sources are licensed under the MIT-0 license:
    • all examples under man/
    • src/systemctl/systemd-sysv-install.SKELETON
    • config files and examples under /network
  • the following sources are under Public Domain (LicenseRef-murmurhash2-public-domain):
    • src/basic/MurmurHash2.c
    • src/basic/MurmurHash2.h
  • the following sources are under Public Domain (LicenseRef-lookup3-public-domain):
    • src/libsystemd/sd-journal/lookup3.c
    • src/libsystemd/sd-journal/lookup3.h
  • the tools/chromiumos/gen_autosuspend_rules.py script is licensed under the BSD-3-Clause license.
  • the following sources are under Public Domain (LicenseRef-alg-sha1-public-domain):
    • src/fundamental/sha1-fundamental.c
    • src/fundamental/sha1-fundamental.h
  • the following files are licensed under BSD-3-Clause license:
    • src/boot/efi/chid.c
    • src/boot/efi/chid.h
  • Heebo fonts under docs/fonts/ are licensed under the SIL Open Font License 1.1,
  • any files under test/ without an explicit license we assume non-copyrightable (eg: computer-generated fuzzer data)

OpenSSL Notes

Note that building the systemd project with OpenSSL does not affect the libsystemd.so shared library, which is not linked with the OpenSSL library.