Enumerated data type used to describe the target object of a permission request.
Values:
| IG_PDF_PERM_REQ_OBJ_DOC | 1 | Document. |
| IG_PDF_PERM_REQ_OBJ_PAGE | 2 | Page. |
| IG_PDF_PERM_REQ_OBJ_LINK | 3 | Link. |
| IG_PDF_PERM_REQ_OBJ_BOOKMARK | 4 | Bookmark. |
| IG_PDF_PERM_REQ_OBJ_THUMBNAIL | 5 | Thumbnail. |
| IG_PDF_PERM_REQ_OBJ_ANNOT | 6 | Annotation. |
| IG_PDF_PERM_REQ_OBJ_FORM | 7 | Form. |
| IG_PDF_PERM_REQ_OBJ_SIGNATURE | 8 | Signature. |
| IG_PDF_PERM_REQ_OBJ_LAST | 9 | Used for checking cache size. |