PDFEncryption (Apache FOP 2.4 API)

All Known Implementing Classes:

PDFEncryptionJCE
```
public interface PDFEncryption
```
This interface defines the contract for classes implementing PDF encryption.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`applyFilter(AbstractPDFStream stream)`	Adds a PDFFilter to the PDFStream object
`byte[]`	`encrypt(byte[] data, PDFObject refObj)`	Encrypt an array of bytes using a reference PDFObject for calculating the encryption key.
`Version`	`getPDFVersion()`	Returns the PDF version required by the current encryption algorithm.
`java.lang.String`	`getTrailerEntry()`	Returns the /Encrypt entry in the file trailer dictionary.

- Method Detail
  - applyFilter
```
void applyFilter(AbstractPDFStream stream)
```
    Adds a PDFFilter to the PDFStream object
    
    Parameters:
    
    stream - the stream to add an encryption filter to
  - encrypt
```
byte[] encrypt(byte[] data,
               PDFObject refObj)
```
    Encrypt an array of bytes using a reference PDFObject for calculating the encryption key.
    
    Parameters:
    
    data - data to encrypt
    
    refObj - reference PDFObject
    
    Returns:
    
    byte[] the encrypted data
  - getTrailerEntry
```
java.lang.String getTrailerEntry()
```
    Returns the /Encrypt entry in the file trailer dictionary.
    
    Returns:
    
    the string "/Encrypt n g R\n" where n and g are the number and generation of the document's encryption dictionary
  - getPDFVersion
```
Version getPDFVersion()
```
    Returns the PDF version required by the current encryption algorithm.
    
    Returns:
    
    the PDF Version