Existing users, 
There is no way in Apple Numbers to protect individual documents with passwords, so I cannot use it.
Apple Numbers
Spreadsheet app (part of iWork 9.0.2 update)
Version: 2.0.3
No document password protection
Feedback Type: Commentary
Contributed by: ghharman Monday, August 13 2007 @ 11:16 AM PDT
Product Platform: MacOSX
Used Product For: Less than a month
Recommend Product: NO
Comments
No document password protection - ianbag
I agree , its the only problem I have with numbers. But needs protection from casual users.I.B.
Thursday, September 27 2007 @ 10:44 PM PDT
No document password protection - Martin Turner--2008
Excel's password protection is a chimera — something which has fooled many users into believing they have secured their document.Essentially, all that Excel password protection does is prevent you from opening he document in Excel - it does not encrypt the file, meaning that you can very easily view it in some other application.
Numbers is (imho) quite right not to include this 'feature'. MacUsers can encrypt files using zip or put them onto the FileVault, but the false sense of security put out by Excel's password function is something that does not belong in this product.
Wednesday, January 30 2008 @ 12:00 AM PST
No document password protection - ianbag
I agree , its the only problem I have with numbers. But needs protection from casual users.I.B.
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Thursday, September 27 2007 @ 10:44 PM PDT