At least one signature of the document is invalid, that is, it should be shown with a red cross of similar in the UI.
The document does not contain digital signatures.
All of the signatures of the document are valid, that is, it should be shown with a green checkmark or similar in the UI.
All of the signatures of the document are valid with concerns, that is, it should be shown with a yellow warning or similar in the UI.
The different possible validation states of the document. Based on the validation of the digital signatures it contains.