Check out the offerings from softmaker
http://www.softmaker.de/index_en.htm. Passwords are the least of your problems with pocket excel; just wait until your formulas, charts, and comments are deleted (no warning, no notification, just gone). Planmaker is an excellent program, as is textmaker (a vastly superior substitute for pocket word). They aren't cheap (although there are some very good sales from time to time), but they are worth their cost even at full price.