On May 13, 2016, IBM Flash10863 was updated to inform users that all internet delivery of z/OS product and service orders must use a secured download method by May 22.
A summary of the flash was provided on May 5 by Marna Walle in her SHARE blog, “Are you electronic delivery secure?”. Essentially, you can no longer use standard FTP for obtaining software, but must instead use FTPS, HTTPS, or “store and forward”. The encrypted options have been available for years now, so hopefully you have already switched over to one of the secure options. However, if you have not, you should do so NOW – don’t wait until you need a PTF.