certificationLevel
The permission level when this is a certification signature (/DocMDP, ISO 32000-1, 12.8.2.2): 1 allows no change, 2 allows filling in forms and signing, and 3 also allows annotations. Null for an approval signature.
The permission level when this is a certification signature (/DocMDP, ISO 32000-1, 12.8.2.2): 1 allows no change, 2 allows filling in forms and signing, and 3 also allows annotations. Null for an approval signature.