Downloadable products set up automatically?

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Without going into great detail, customers will use my web site to process documents. Once processed I'd like to make a document available only to the particular customer who provided it, as a monthly paid subscriber.

 

Is there any way to make downloadable files available to customers, through osC automatically? Without having to set up each downloadble product in add product in Admin?

 

In other words, Customer A's document is processed and is sent to a folder only he can access via an emailed link.

 

Customer B's document is processed and is sent to a folder only she can access via an emailed link.

 

etc.

 

Any assistance will be appreciated.