We do not under any circumstances pass e-mail addresses or any other information to third parties or use the information for any marketing purposes whatsoever,an e-mail address is not required to download the Full screen calculator free trial. On buying (registering ) the calculator we will retain the e-mail address used in order to advise you when free updates becoming available. If you do not wish us to do this please contact us quoting your purchase id number and the relevant e-mail address and we will remove the address from our list, you can also obtain information on updates from free updates