Copyright notice removed

In https://github.com/jaraco/inflect/commit/e640d3a08b1e55095be378b4f4b6e4b6806eb7fb#r120831163, @pwdyson expressed concern about the removal of the copyright notice. In that commit, I'd given some allusion to the motivation behind it, but I'm opening this issue to capture in more detail the motivation and to address Paul's request (alongside #194).

Start by reading the linked commit discussion and issue #194 to understand the concern about the removed copyright notice and the motivation described there. Confirm what decision or documentation change is needed, then ensure the issue's requested motivation and Paul's request are addressed without leaving the copyright question unresolved.

Written by the indexing model from the issue text.