Use Adobe Sign for Secure Document Delivery?

I am evaluating Adobe Sign for use as a one-way secure document delivery solution that provides a delivery receipt once the recipient has received and downloaded the document(s).  We sometimes need the document itself to be signed by the recipient and returned, but it is far more common that we just need one-way delivery to the recipient and some log, email notice or something simple acknowledging receipt and download.

These documents contain sensitive information, which is why we cannot use email.  These documents must be delivered through a secure web service and we need some way of restricting access to only those clients the documents are intended for.  Ideally, that would involve a log-in and strong password with a one-time code sent to the user's smart phone.  Once the client downloads the document to their computer, the original should be automatically deleted from the website.

Can Adobe Sign be used for documents that do not require signatures and return of the executed documents back to the sender?  Can Adobe Sign deliver documents in a relatively secure manner as described above?   Can it provide a delivery acknowledgement receipt and automatic deletion post-delivery?

If Adobe Sign cannot be used as described, can you recommend another product?

Thanks very much!