private void clearEncrypt03() {
        if (StringUtils.isEmpty(writeWorkbookHolder.getPassword())
            || !ExcelTypeEnum.XLS.equals(writeWorkbookHolder.getExcelType())) {
            return;
        }
        Biff8EncryptionKey.setCurrentUserPassword(null);
    }
Clears encryption settings for older Excel formats.
fastexcel-core/src/main/java/cn/idev/excel/context/WriteContextImpl.java