The question isn't so much how sensitive WE are to copyright. If we could, we would happily include everything.How sensitive are you to copyright? If it's just the videos which are the issue, both storylines would work without them.
The problem is that the copyright owners might have a problem with us using their content in a standalone game.
They might tell us to remove their content or they might try to put a stop to the game altogether or maybe even sue us for copyright infringement.
We'd prefer steering well clear of that...
The way we always figured it for HoO, which I think still holds true here, is that anything under copyright can be added as an additional download.Or are "Jack Sparrow" and "Hornblower" at risk because their plots are partly derived from their respective film and TV sources? In that case, anyone writing new storylines will need to be careful to write original stories not based on any existing film, TV or book.
So the base game itself should be clean of anything under copyright to avoid any potential legal attacks against NHR itself.
This means that probably the entire "Tales of a Sea Hawk" storyline would have to be excluded from the base game.
After all, that is a near-carbon copy of contents from a game owned by Akella/Bethesda/Disney.
But the Assassin, Bartolomeu, Ardent and Woodes Rogers should be fair game.
If we maintain the idea we had for HoO, then any such content can still go in an additional download.