This whole thread started with
> He's dead.
The point being that they're not getting paid for their work. Perhaps their descendants are, or far more likely these days, their employer.
Copying without paying a >50 year old book: no real negative consequences
Copying without paying a seed that was developed in the last few years: significant negative consequences
(Obviously there are significant positive consequences to pirating that rice. But limited-term IP strikes a reasonable balance between getting more done and also releasing it to the public.)