property UserPermissions;
Returns the user-password permission bits (a subset of Permissions).
Equal to Permissions when the document is opened with the owner password.
Wraps the corresponding PDFium API and exposes it as a TPdf instance member so consumers do not have to manage FPDF_DOCUMENT handles directly.
Pdf1.Active before calling page-scoped operations; methods that require an open document raise EPdfError otherwise.SaveToFile to persist.
if Pdf1.Active then
Pdf1.UserPermissions;