I would like to hear a brief overview of copywrite restraints on using
ep letters, poems, and essays in a work of fiction/drama/etc.

Is it correct to think that anything of ep's published 70 years ago is
now in the public domain? If so, would it be correct to base my
calculation on the original date of publication rather than on the date
of some current edition of the work (cantos, essays, shorter poems)? For
work that is clearly not in the public domain, would the copywrite
holders be likely to be generous?

I suppose it would be helpful for me to be more concrete. Let's imagine
a fictionalized biography, something like a novelization of Pound's life
that would require a lot of his own language. What are the copywrite
considerations likely to be?

Many thanks.

Wayne Pounds