I couldn't think of a better question to ask, but I will explain more here.
I want to be able to send a Word document to a server that will work with the document data. Are there any good ways to do that without the owner of the server to be able to read the content of the document him/herself? I only want a pre-made program on the server to be able to access the content. Eventually, when the program on the server is finished with modifying the document, it will get sent back to me. Are there any ways to make sure the document disappears from the server, and don't get copied from the server?
I may be waay of regarding what's really possible to do with cryptography here. I am a beginner, and am trying to learn more.