There is no absolute way. The information here may interest you:
http://www.officearticles.com/misc/p...plications.htm

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Hope it helps!
Anne Troy
www.OfficeArticles.com
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"ernie" wrote in message
...
How do i go about protecting my work in such a way that cracks from the
internet dont reveal my password and the end user can only use the
workbook
to do just what it was made to do?

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help a friend help you