LICENSE.md

   1 # Userspace RCU library licensing
   2
   3 This project is compliant with the [REUSE](https://reuse.software/spec/)
   4 specification, each file contains [SPDX](https://spdx.org/specifications) tags,
   5 the full licenses can be found in the `LICENSES/` directory.
   6
   7
   8 ## Library code
   9
  10 The library part is distributed under `LGPL-2.1-or-later`. See
  11 `LICENSES/LGPL-2.1-or-later.txt` for license details. Refer to the individual
  12 file headers for details.
  13
  14 LGPL-compatible source code can statically use the library header using :
  15
  16 ````
  17 #define _LGPL_SOURCE
  18 #include <urcu.h>
  19 ````
  20
  21 Dynamic-only linking with the LGPL library is used if `_LGPL_SOURCE` is not
  22 defined. It permits relinking with newer versions of the library, which is
  23 required by the LGPL license.
  24
  25 See `lgpl-relicensing.md` for details.
  26
  27
  28 ## Headers
  29
  30 Most headers are also distributed under `LGPL-2.1-or-later`, some include code
  31 from `atomic_ops` and are distributed under `Boehm-GC` and some others are
  32 distributed under `MIT`. Refer to the individual file headers for details.
  33
  34 xchg() primitive has been rewritten from scratch starting from `atomic_ops 1.2`
  35 which has a MIT-style license that is intended to allow use in both free and
  36 proprietary software:
  37
  38 ````
  39 http://www.hpl.hp.com/research/linux/atomic_ops/LICENSING.txt
  40 http://www.hpl.hp.com/personal/Hans_Boehm/gc/gc_source/
  41 ````
  42
  43
  44 ## Tests
  45
  46 Library test code is distributed under the `GPL-2.0-only` license. See
  47 `LICENSES/GPL-2.0-only.txt` for license details. See headers of individual
  48 files under `tests/` for details.
  49
  50
  51 ## Documentation
  52
  53 The documentation is distributed under the `CC-BY-4.0` license.
  54
  55
  56 ## Build system
  57
  58 Build system related files are mostly distributed under the `MIT` license. See
  59 headers of individual files for details.
  60
  61
  62 ## Generated data files
  63
  64 Generated data files are distributed under the `CC-1.0` license.