Software license
The key words “MUST”, “MUST NOT”, “SHOULD”, etc. are to be interpreted as described in RFC 2119.
All nf-core pipelines MUST be released with an MIT license.
Other scripts MUST NOT be bundled within the workflow if they have a different or incompatible license (for example, in the bin directory).
If you need such a script, even a simple one, it SHOULD be released on bioconda instead and referenced like any other software.
If adding to bioconda is not possible, custom script files written explicitly for the pipeline MUST include a comment at the top with the license information matching that of the pipeline. See here for an example.