| Package | Description | 
|---|---|
| org.apache.pdfbox.examples.signature | These examples will show how to gain access to the PDF signature. | 
| org.apache.pdfbox.pdfwriter | This is the persistence layer used to write the PDFBox documents to a stream. | 
| org.apache.pdfbox.pdmodel | The PDModel package represents a high level API for creating and manipulating PDF documents. | 
| org.apache.pdfbox.pdmodel.fdf | The fdf package will handle all of the logic used for FDF objects inside of the PDF/FDF document. | 
| org.apache.pdfbox.pdmodel.interactive.digitalsignature | The digitial signature library will manage signatures that are stored in the PDF document. | 
| org.apache.pdfbox.pdmodel.interactive.digitalsignature.visible | This is the visual signature part that help creating the visual representation for the digital signature. | 
| org.apache.pdfbox.pdmodel.interactive.form | The interactive package contains classes for handling Interactive Forms, also known as "AcroForms". | 
| Class and Description | 
|---|
| PDSignature This represents a digital signature that can be attached to a document. | 
| SignatureInterface Providing an interface for accessing necessary functions for signing a PDF document. | 
| Class and Description | 
|---|
| SignatureInterface Providing an interface for accessing necessary functions for signing a PDF document. | 
| Class and Description | 
|---|
| ExternalSigningSupport Interface for external signature creation scenarios. | 
| PDSignature This represents a digital signature that can be attached to a document. | 
| SignatureInterface Providing an interface for accessing necessary functions for signing a PDF document. | 
| SignatureOptions This contains the visual signature as a COSDocument, its preferred size and the page. | 
| Class and Description | 
|---|
| PDSignature This represents a digital signature that can be attached to a document. | 
| Class and Description | 
|---|
| ExternalSigningSupport Interface for external signature creation scenarios. | 
| PDPropBuild A signature build dictionary as specified in the PDF Signature Build Dictionary Specification. | 
| PDPropBuildDataDict The general property dictionaries from the build property 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. | 
| Class and Description | 
|---|
| PDSignature This represents a digital signature that can be attached to a document. | 
| Class and Description | 
|---|
| PDSeedValue This represents a pdf signature seed value dictionary. | 
| PDSignature This represents a digital signature that can be attached to a document. | 
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