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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 the **GNU Lesser General Public License v2.1 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 udev sources under src/udev/ are licensed under **GPL-2.0-or-later**, so the
+   udev binaries as a whole 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 src/shared/initreq.h header is licensed under original license,
+   **LGPL-2.0-or-later**.
+ * 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
+   - tools/check-includes.pl
+  * 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.
+ * 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.