I was watching Order of the Phoenix today and during the Occlumency scene I wondered if Legilimency is a Dark Art or even legal at all? Snape says to Harry:
‘Then you will find yourself easy prey for the Dark Lord!’ said Snape savagely. ‘Fools who wear their hearts proudly on their sleeves, who cannot control their emotions, who wallow in sad memories and allow themselves to be provoked so easily – weak people, in other words – they stand no chance against his powers! He will penetrate your mind with absurd ease, Potter!’
Order of the Phoenix -- page 473 -- Bloomsbury -- Chapter 24, Occlumency
Snape presents Legilimency to Harry as if it were almost a predatory type of magic; he makes no mention of how Legilimency might be used in a positive way.
Is Legilimency a Dark Art?
Pursuant to the question about Legilimency being a Dark Art, I also wonder, is performing Legilimency even legal? Does J.K. Rowling address any legal issues regarding the use of Legilimency? For example, is a Legilimens required to register with the Ministry like Animagi are? Is there any canon source that addresses any guidelines regarding Legilimency?
Please no HP Wikia answers; subjective answers in the spirit of canon are fine.