Hi,
I tried to wrote patch for export/import of protected
worksheets/workbook of Excel - attached to Bug 330129
http://bugzilla.gnome.org/show_bug.cgi?id=330129
And I discovered that protection of sheets is not implemented even in
native file-format .gnumeric. So I did it too, I hope it's clean
solution: attached to Bug 334257
http://bugzilla.gnome.org/show_bug.cgi?id=334257
Please check that patches carefully, I'm still beginner and there could
be some new bugs inside.
What is not implemented is storing of password. Any idea?
(It's not strong security password, just for protect a bit more
accidental modification. Different stronger implementation should be
used in the future for open-only-if-you-know-password files).
Excel has hash function which is described in 5.18.4 in
http://sc.openoffice.org/excelfileformat.pdf
Klokan
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