Excel Conversion to web or PC app

We have developed a complex spreadsheet in Open Office Calc (can also work in Excel) that we wish to have converted into a secure application, so that we can sell it without it being easily copied and passed around. We would be happy with either a web based application, accessible through password logon, or a free standing PC application.? If web based, it needs to tie in to a database (asp?) so each individual user's information will be stored for their next use.? Please only bid on this if you have done a job like this before. ## Deliverables With signature of a non-disclosure agreement, we have screen shots available to show of the prototype. ? Again - we do not need a web based application AND a desktop application > one OR the other - not both. ? Time to completion, feasibility and cost will determine our choice of which way to go.