Aspiring Lurker (He/Him)
Thanks for answering it seriously.This is a great question and a great way to focus conversation. Thanks for asking it.
I have no issues with your descriptions of agency types, so I'll move on ...
That's reasonable. I guess I was thinking about corroborative/cooperative authorship, or possibly playing in a band (I've done both). The player is the author of his character, using the game system at the table (I mean, it's no use to bring a FATE character to a D&D game, or vice versa, right?). The entire table is generating a story (or a story is emerging from the entire table playing a game), and the player is directly responsible for a portion of it, centered on one character. I'm thinking this through more or less right now, but I guess I'm at a point where Player's authorship of Character is absolute, within the rules of the game, until/unless it interferes with another Player's authorship. The GM has (mostly) authorship of the world/setting, and I'm not entirely sure where the boundaries are between that and Player authorship (or, I'm not sure I can elucidate them; I think I have a decent nonverbal feel for them, though).How do you think "authorial choice" and "participant choice" relate to one another when you've got competing interests and rules/role constraints that bind or deny authorship rights?
Put another way, the GM can't do x because system or built-in constraint (a players move/feature says thing n happens; GM doesn't get to ignore it or erect a block that negates it) says so. The player can't do y because system or built-in constraint (the GM has erected an obstacle that requires overcoming a certain fictional positioning - say reach advantage by the obstacle - before the player can close to melee...the player doesn't just get to ignore that and close to melee).
I would say "participant choice" is different than "authorial choice" because when you're writing a book, you don't have competing interests and system architecture that both constrains possible fiction and mediates outcomes.
I'm not sure I've answered your question about constraints and bindings on authorship rights.