> Unclear candidates will be removed from the distribution.

When you do get down to undertaking this, please document or direct others to a list of such exclusions so we can have "non-free" add-ons. Not all distributions will exclude packages with content from public domain that we don't know the license of. In Arch Linux, we include a document for such cases; if there is no authority a reason can be included as to why the license is not known (public domain where contributors do not highlight the license clearly and where the importance of licensing is not stressed enough).