Digital delivery module for Magento

We require a digital delivery module for Magento. The products we sell are digital data. However the data is not directly available it needs creation time of 1-2 days. The idea is to have an extra field for this within the Sales/Send(Shipment) menu of Magento, where you would normally add for example the tracking number of shipment partner. The customer should receive an email with the notification, that his file is ready for download. The email should contain a unique link. The link goes to a webpage where customer can download file and also has additional information/links. The features the digital delivery module needs to have. · Uploading the digital data · Creating an unique download link · Optional password protection of the download with automatic password generation · Email notification templates. We need the choice of different Email templates to notify customer. We want an option to add further templates later on. · Download page templates. We need the choice of different download page templates. We want an option to add further templates later on.