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## org.apache.fop.pdf
Interface PDFEncryption

All Known Implementing Classes:
  PDFEncryptionJCE

    public interface PDFEncryption

This interface defines the contract for classes implementing PDF encryption.

Method Summary
`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.
`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

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