src/main/java/org/imsglobal/lti/BasicLTIUtil.java
public static String prepareForExport(String descriptor) {
        Map<String, Object> tm = null;
        try {
            tm = XMLMap.getFullMap(descriptor.trim());
        } catch (Exception e) {
            M_log.warning("BasicLTIUtil exception parsing BasicLTI descriptor"
                    + e.getMessage());
            return null;
        }
        if (tm == null) {
            M_log.warning("Unable to parse XML in prepareForExport");
            return null;
        }
        XMLMap.removeSubMap(tm, "/basic_lti_link/x-secure");
        String retval = XMLMap.getXML(tm, true);
        return retval;
    }
public static String prepareForExport(String descriptor) {
        Map<String, Object> tm = null;
        try {
            tm = XMLMap.getFullMap(descriptor.trim());
        } catch (Exception e) {
            M_log.warning("BasicLTIUtil exception parsing BasicLTI descriptor"
                    + e.getMessage());
            return null;
        }
        if (tm == null) {
            M_log.warning("Unable to parse XML in prepareForExport");
            return null;
        }
        XMLMap.removeSubMap(tm, "/basic_lti_link/x-secure");
        String retval = XMLMap.getXML(tm, true);
        return retval;
    }
Remove fields that should not be exported