i am using crystal reports 2008 and java .
i want to restrict download options (format types) when report appears on web page.
i have tried this code but it seems that it has no effect

ExportOptions oExportOptions = new ExportOptions();
oExportOptions.setExportFormatType(ReportExportFormat.PDF);
ReportExportControl oReportExportControl = new ReportExportControl();
oReportExportControl.setReportSource(reportSource);
oReportExportControl.setExportOptions(oExportOptions);
oReportExportControl.setExportAsAttachment(true);