Import of protected xls file into website + javascript to unprotect before start

Guys,
I have an online application where I need to upload excel file (imagine field for file path plus BROWSE button). There are some things to happen with the file once it is imported. However, excel files are protected and for the successful job, the file has to be unprotected (all sheets). The thing is I do not want let the users unprotect the file before actual import (they might screw up some elements). Do you think or do you know some javascript which I could implement in the website that the first step after importing the file will be unprotecting it and then the rest would continue?

Thanks a lot!
Trevi

This wouldn't be done in Javascript, it would be done in a server side language (c#, vb.net, java, php, ruby, python etc), there are libraries available for all the listed that allow interaction with Excel.

Though I'm not sure that you would need to un-protect the sheets to read them as a database