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+
+| Title | Export license packages for static and header-only libraries |
+
| Status | Proposed |
+| Author(s) | Daniel Ching <carterbox@users.noreply.github.com> |
+| Created | Jul 9, 2022 |
+| Updated | Jul 25, 2022 |
+| Discussion | NA |
+| Implementation | NA |
+
+
+## Abstract
+
+This CFEP proposes that header-only and static libraries should be required
+to run_export an empty package (containing their license) called "{{ name
+}}-license" in order to ensure/automate attribution and to satisfy the license
+requirements.
+
+## Specification
+
+Header-only or static library packages should include an output called
+"{{ name }}-license" which is added as a run_export for the library.
+
+## Motivation
+
+Attribution for header-only and static libraries on conda-forge is not well
+enforced because unlike shared libraries which are also required to be
+installed again at runtime (with license included), these libraries need manual
+intervention to ensure that the license of the header-only or static library is
+concatenated to the license metadata of the downstream library which uses it.
+This should obviously be done and is easy to notice for static libraries (whose
+names end in "-static"), but for header-only libraries it is less obvious
+because the name of the library does not obviously mark the library as
+header-only.
+
+Libraries like Eigen and Pybind11 are commonly used, but probably not
+attributed beyond their mention in the host section of the recipe. Mention in
+the requirements section of a recipe probably does not meet the
+licensing/attribution requirements.
+
+## Rationale
+
+run_exports is the obvious way to deliver the license information into the
+environment of downstream packages; this is already how the license information
+is included for dynamically linked libraries.
+
+"{{ name }}-license" matches the exisiting naming scheme for "{{ name }}-static"
+"{{ name }}-includes".
+
+## FAQ
+
+### How does this affect current builds of packages?
+
+It doesn't. The changes will slowly be implemented over time as packages and their
+downstream packages are rebuilt with regular releases. Migrations are a tool
+that could be used to if desired for certain packages.
+
+## Copyright
+
+All CFEPs are explicitly [CC0 1.0 Universal](https://creativecommons.org/publicdomain/zero/1.0/).