... it was never even established what the proceedings were about.
But it
is established in the episode. Data is resigning. He's packing his bags when they stop him
PHILLIPA: He can refuse to undergo the procedure, but we can't stop the transfer.
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PHILLIPA: There is always an option. He can resign.
See, He
can refuse the procedure, but only because of the fact that he can resign his commission
MADDOX: (To Phillipa) Data must not be permitted to resign.
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PHILLIPA: That's an interesting point. But the Enterprise computer is property. Is Data?
MADDOX: Of course.
So, it is established that the trial is being brought to fight the claim that Data is property, & thereby cannot be allowed to resign from Starfleet, in order to refuse this procedure. That is the full scope of this trial. Firstly, Data is granted the status of not being property
PHILLIPA: Is Data a machine? Yes. Is he the property of Starfleet? No.
She may not have worded it such, but that is a ruling, because his status as property which has no freedom to leave Starfleet is what the trial is about. She had to rule on that, & did. She expounds further
PHILLIPA: Does Data have a soul? I don't know that he has. I don't know that I have. But I have got to give him the freedom to explore that question himself. It is the ruling of this court that Lieutenant Commander Data has the freedom to choose
The bold section is all part of one statement, not two mutually exclusive ponderings. So, what is the freedom to choose how he will explore himself, if not a freedom of a being to choose his own fate? She's indicating that as he is not property, he is considered a being in Starfleet, with the rights of all beings in Starfleet, including that he can leave when he wants. Data then addresses Maddox, by simply saying
DATA: I formally refuse to undergo your procedure.
What he didn't say was "I formally refuse to let you force me into the procedure, by transferring me, as I will leave Starfleet to prevent it. He didn't say that, because he didn't have to. She did... poorly, but she did say it
I think "ownership" of Lal is a bit trickier that Data. Lal was built on a Starfleet vessel most likely using Starfleet materials.
As I stated, that's a moot point, because Data himself likely has replacement parts from injury that were Starfleet owned. Picard's heart & Geordi's eyes are starfleet components. Does Starfleet own Geordi & Picard? Of course not. They are all beings not subject to ownership, & Data's trial defined that status for him & all like him
^Again: the question was not about whether Starfleet had the right to "own" Lal.
True. The issue was that Starfleet decided it had the right to usurp Data's guardianship over his own creation, (One made from himself even) & take possession of her, for the purpose of taking control over her existence. It is still wrongful detention. What place does Starfleet have to claim custody over a civilian, from someone else's claim of guardianship. To my knowledge, they aren't even an organization involved with civilian guardianship/custody in any case other than this one, because it holds scientific benefits for them
Hell, they couldn't have been happier to back away from the screaming teen who was raised by bumpy headed aliens in
Suddenly Human. No, they just
want Lal, plain & simple, & frankly, there is some ownership motives there, I think, which at least harkens back to the property issue, if not fully reclaiming it