---
title: C SDK licenses
source: https://docs.newrelic.com/docs/licenses/product-or-service-licenses/new-relic-apm/c-sdk-licenses
---

> #### ⚠️ EOL NOTICE
>
> From April 2022, we don't support the C SDK capability. For more details, see our [Support Forum post](https://support.newrelic.com/s/hubtopic/aAX8W0000008d0r/q1-bulk-eol-announcement-fy23).

In addition, the C SDK uses source code from third-party libraries, which are licensed under their own terms. This document lists these other third-party libraries and their licenses.

> #### ⚠️ IMPORTANT
>
> New Relic contributed the C SDK to the open source community under an [Apache 2.0 license](https://github.com/newrelic/c-sdk/blob/master/LICENSE).

| **Library**                                                                           | **License**                                                                                                                                                                                                                                          |
| ------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [cJSON](https://github.com/DaveGamble/cJSON)                                          | [MIT](https://github.com/DaveGamble/cJSON/blob/0b5a7abf489e52d0e20a3de03bfffd674142b900/LICENSE)                                                                                                                                                     |
| [curl](https://curl.haxx.se/)                                                         | [curl](https://curl.haxx.se/docs/copyright.html)                                                                                                                                                                                                     |
| [FlatBuffers](https://google.github.io/flatbuffers/)                                  | [Apache 2.0](https://github.com/google/flatbuffers/blob/ecd76e898dadb71096fdb3a7701a863c399de6c0/LICENSE.txt)                                                                                                                                        |
| [FreeBSD C library](https://www.freebsd.org)                                          | [FreeBSD](https://www.freebsd.org/copyright/freebsd-license.html)                                                                                                                                                                                    |
| [Go](https://golang.org/)                                                             | [Go](https://golang.org/LICENSE)                                                                                                                                                                                                                     |
| [Go supplementary network libraries](https://github.com/golang/net/)                  | [Go](https://golang.org/LICENSE)                                                                                                                                                                                                                     |
| [libbsd](https://libbsd.freedesktop.org/wiki/)                                        | [2 clause BSD](https://gitlab.freedesktop.org/libbsd/libbsd/blob/0.9.1/include/bsd/sys/tree.h#L5-28)                                           [3 clause BSD](https://gitlab.freedesktop.org/libbsd/libbsd/blob/0.9.1/include/bsd/sys/cdefs.h#L1-25) |
| [libpq](https://www.postgresql.org/)                                                  | [PostgreSQL License](https://www.postgresql.org/about/licence/)                                                                                                                                                                                      |
| [MD5](https://openwall.info/wiki/people/solar/software/public-domain-source-code/md5) | [Public Domain](https://openwall.info/wiki/people/solar/software/public-domain-source-code/md5)                                                                                                                                                      |
| [min-max-heap](https://github.com/ilbanshee/min-max-heap/)                            | [MIT](https://github.com/ilbanshee/min-max-heap/blob/6bd6fb31bd1e4d5b78fe18175968153c152c7f8b/LICENSE)                                                                                                                                               |
| [Portable OpenSSH](https://github.com/openssh/openssh-portable)                       | [TSRM (BSD-style)](https://github.com/openssh/openssh-portable/blob/285310b897969a63ef224d39e7cc2b7316d86940/openbsd-compat/reallocarray.c#L2-L16)                                                                                                   |