Part of women’s lib was freedom from restrictive decency laws.
It makes sense when you see what bathing suits used to look like.
And the fact that police would enforce bathing suit rules at public beaches
Star Trek was released in the 60s when the bikini and the miniskirt were very popular and countercultural, so modest clothes would have seemed anachronistic (well, not futuristic).
The 2a is so that the government can press you (and the weapon you bought) into service.
The clearest examples of this is when the government pressed citizens (and their weapons) into service to shoot tax protestors during Shay’s Rebellion and The Whiskey Rebellion.
The government didn’t want a standing army hanging around thinking about coups and figured they could min-max their way around it with militias.
The closest modern analog is The National Guard. A 2a written today with the original intent would allow The National Guard to keep a rifle at home. And there would be no standing army.
Strictly speaking, copyright applies to a particular expression of an idea — in this case, a recording of a performance. Copyright also applies to the arrangement — you can’t (legally) sell copied sheet music.
As a practical matter, artists seek permission to cover (hah) their bases and because the recording industry is functioning like a cartel. Don’t cover our songs and we won’t cover yours without permission.
But we saw Taylor Swift cover her own songs. She didn’t seek permission (or did and it wasn’t given). She now owns the copyright to the covers, but not the originals. The owner of the originals is mad about it but she doesn’t care about maintaining a good relationship with the owner.
She might be on firmer legal ground since she wrote the songs and was the original recording artist, and will win in the court of public opinion, but labels hate that idea and will fight it anyway.
But you see why artists are much more prone to cover others’ music during live shows. They have a stronger legal defense since it isn’t a recording and would ruffle fewer record label execs’ feathers.
“Whatever’s normal.”