So McGredy was registering Picasso as a trademark? I guess you would need permission to do that. Still, I think Picasso was at least as savvy at PR and self promotion as he was at art - which is saying a lot.
Recall that at the time $10,000 was a year's salary for a middle class American. Not a bad fee for signing your name.
Does the ARS require personal permission for roses to be registered after living persons, I wonder? What are the legal implications of naming a rose after a famous person without getting their consent? Surely I could name a rose Aunt Millie and register it with the ARS without any further ado.