ConstReadonlyVIEWER: "viewer"ReadonlyANNOTATIONS: "annotations"Annotations mode, allows annotation editing
ReadonlyCONTENT_EDITOR: "contentEditor"Content editor mode, allows editing text, images of PDF document
ReadonlyFORMS: "forms"Forms mode, allows adding text fields, signature fields, list boxes, etc.
ReadonlySIGNATURES: "signatures"Signatures mode, allows adding signature fields for electronic signing, digital signing, verifying digital signatures
Viewer mode, allows viewing PDF only, cannot edit annotations, forms, etc.