Regarding copyrights for source code files, some of the files in the codebase are incorrectly copyrighted...
The trick is that for it to be legal, the name must be a legal entity (i.e., a real person's real name). So for example, 'The Inkscape Project' would not be a legal copyright holder, unless we did the paperwork to incorporate it, paperwork to assign our copyrights over, etc.
I'm not certain about pseudonyms, but would assume those are similarly not valid, unless you legally registered that name or something.
I doubt we'll ever get into legal trouble, although you never know. But more importantly, if other projects start reusing our code, they may be more strict about copyrights being properly set.
Anyway, not a major issue but probably worth some thought.
Bryce