Hi all,
I just found out about 
ssconvert from a Stack Overflow answer and have an application that 
would involve using it to read encrypted spreadsheets (though the output
 would not need to be encrypted). I gave ssconvert a try to see if I 
could get it to work, and here's as far as I got:
lop@Lenovo-N22 ~ $ ssconvert text.xls -T Gnumeric_stf:stf_csv
E No password supplied
The
 "No password supplied" error message makes me hopeful, but I don't see 
anything in the documentation about how to supply a password. Is there a
 way?