Which properties can be read and changed?
Both the built-in document properties — title, author, subject, keywords, company, created and modified times — and any custom properties the deck carries.
Does editing metadata rewrite the whole presentation?
The file is saved again, so its bytes change, but the slides themselves are untouched. Only the property values differ.
Can I strip identifying metadata before sharing a deck externally?
Yes — clearing author, company and custom properties is a common pre-publication step. Note that comments and speaker notes are separate; removing them is
annotation
work, not metadata work.
Is the modified date updated automatically when I save?
Not on its own — it is a property like any other. Set it explicitly if you want it to reflect the change your code just made.
