I just found something that makes me think we all need to consult Copyright Lawyers:

Works Reproduced in Machine-Readable Copies
• With or near the title or at the end of the work,
on visually perceptible printouts
• At the user’s terminal at sign-on
• On continuous display on the terminal
• Reproduced durably on a gummed or other label
securely affixed to the copies or to a container
used as a permanent receptacle for the copies

(From https://www.copyright.gov/circs/circ03.pdf)

How does this affect viewing source code in an editor displayed on a computer screen?

Does viewing source code in an editor displayed on a computer screen qualify as a "visually perceptible printout"?

Does a "computer screen" qualify as a "terminal"?

Does opening the source file into the editor qualify as "sign-on"?

Do we need to have the Copyright notice at the beginning of the source files?