Time limited use of excel sheet

[excel_321]

I would like to be able to allow time limited use of some spreadsheet files I provide to some of my clients. Is there a way to let them download one of my files with, for example, a 6 month password, or a 6 month expiration of the sheet, unless I supply a renewal code?

 

[dmt32]

Have a look at chips article here: http://www.cpearson.com/excel/workbooktimebomb.aspx

Do note the limitations Chip outlines with such an approach as a Competent user can thwart any restrictions you may put in place.


A Further Note of caution about using a time limited approach - Whilst you own copyright to your application your clients own the data they enter in to it - if you include something in your workbook that restricts it's use after a time period, your restrictions MUST allow your clients to still access THEIR data.


Dave

 

[excel_321]

Thank you. Is there then a way to password protect all cells once the time limit expires. This way they can still access their data but cannot do anything further with the spreadsheet

 

[dmt32]

You can apply worksheet / workbook protection but this is not secure. Refer to chips site if need further guidance.