Produce a list of licenses of software used in providing the S4 service

[exarkun]

No description provided.

[exarkun]

The Python software portion of this list can be produced like this:

$ pip install leastauthority.com
...
$ pip list --format json | jp --unquoted "join(' ', [].name)" | xargs pip show | grep License | sort | uniq
License: Apache
License: Apache 2.0
License: Apache License, Version 2.0
License: ASL
License: ASL 2
License: BSD
License: BSD-derived (http://www.repoze.org/LICENSE.txt)
License: BSD License
License: BSD-like
License: BSD or Apache License, Version 2.0
License: CC0 1.0 Universal
License: GNU GPL
License: ISC
License: LGPL
License: MIT
License: MIT License
License: MIT/X
License: MPL v2
License: Python Software Foundation License
License: Simplified BSD
License: UNKNOWN
License: ZPL 2.1

It could use some cleanup but this seems like an okay starting point. This does not include any of the licenses of the non-Python software being linked in (for example, pyOpenSSL links in OpenSSL and the given command cannot find a C library like OpenSSL). So this is just one part of the answer.