Following is a check used in web client

if (rights.equals("pddl") || "cc-by".equals(rights) || "cc-by-sa".equals(rights) || "cc-by-nd".equals(rights) || "cc-by-nc".equals(rights) || "cc-by-nc-sa".equals(rights) || "cc-by-nc-nd".equals(rights) || result.isAllowDownload()) {
// now can download
}