* @throws IOException
*/
public InputStream extractRevision(String aFileName, byte[] aPassword, String aSignatureName) throws IOException {
final PdfReader tmpReader = getPdfReader(aFileName, aPassword);
final AcroFields tmpAcroFields = tmpReader.getAcroFields();
return tmpAcroFields.extractRevision(aSignatureName);
}
/**
* It tries to create PDF reader in 3 steps:
* <ul>