See: Description
| Interface | Description | 
|---|---|
| ExternalSigningSupport | Interface for external signature creation scenarios. | 
| SignatureInterface | Providing an interface for accessing necessary functions for signing a PDF document. | 
| Class | Description | 
|---|---|
| COSFilterInputStream | |
| PDPropBuild | A signature build dictionary as specified in the PDF Signature Build Dictionary Specification. | 
| PDPropBuildDataDict | The general property dictionaries from the build property dictionary. | 
| PDSeedValue | This represents a pdf signature seed value dictionary. | 
| PDSeedValueCertificate | This class represents a certificate seed value dictionary that is in the seed value which puts
 constraints on certificates when signing documents. | 
| PDSeedValueMDP | This MDP dictionary is a part of the seed value dictionary and define
 if a author signature or a certification signature should be use. | 
| PDSeedValueTimeStamp | If exist, it describe where the signature handler can request a RFC3161
 timestamp and if it is a must have for the signature. | 
| PDSignature | This represents a digital signature that can be attached to a document. | 
| SignatureOptions | This contains the visual signature as a COSDocument, its preferred size and the page. | 
| SigningSupport | Class to be used when creating PDF signatures externally. | 
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