Allowing "Reader Users" to Save MULTIPLE Unique Sets of Forms Data for One Form

Question

I own Acrobat Pro X. I use it to create many documents in my law practice. I need to deliver a contract form to a client that the client will use again and again and again... The client only owns Acrobat Reader. I need this to be like a "template" in Microsoft Word. The client needs to be able to fill-in the fillable fields on the document that I have created, then print and save it (e.g. as "Jones.pdf"), then fill it with new data and print and save it again (e.g. as "Smith.pdf"). This process may need to be repeated hundreds or thousands of times. Sometimes the client will need to reopen a document (data set) that was previously saved and printed and see it as it was last printed (so, to load "Jones.pdf" and see it as it was created). Sometimes the client will need to send a "filled" PDF to one of his customers, where the client's customer can print the document, but not change any of the fields (much less the body of the document, of course). So to sum up:
* Attorney creates contract with fillable fields in Acrobat Pro X and sends to client;
* Client uses PDF created by attorney to create, print and save an infinite number of unique 'data sets' for the document, any of which can be opened and printed at any time; and
* Client sends locked-down, un-changeable PDF to Client's customer for customer to print, but not change.
All of this needs to be able to happen without the Client ever buying Acrobat. Is this possible? I'm aware of File > Save As > Reader Extended PDF > Enable Additional Features, but I cannot figure out if this will work, since I don't use Reader on my pc.
Surely this scenario is faced by document creators often. However, I tried and failed to find a set of search terms which would reveal discussion threads that were relevant to this query.

Answer 1

I apologize for being unclear. I'll try to clarify the facts.
1. I have written a custom subcontract agreement for one client. This is the only client that I will ever give this particularl document/subcontract. My client will *never* send the data or the document back to me. Once I turn over this document to my client, it is from my perspective, a one-time, one-way transaction.
2. My client
Will be the only person who will ever put data in the fields (using Acrobat Reader);
Will create hundreds or thousands of unique subcontracts using the document that I have created, but the only difference between each will be the data that my client has put in the fields;
Needs to be able save each unique set of data as a unique pdf (jones_1.pdf; smith_2.pdf; etc.);
Needs to be able to email the completed document to his customer in a way that his customer cannot modify the document, but can view it, print it, sign the paper printout and snail-mail it back.
3. My client's customer
Should be able to view and print, but be unable to change anything in the document;
Will not need to sign the document electronically (there will be no digital signatures)
Users of Microsoft Word are familiar with the concempt of templates. When you create a new document based on a template, the content and formatting can be changed in each new iteration made from the template, but the original template is not changed. I could give my client the subcontract as a Word template, but his staff could easily or accidentally change important language that I don't want them to be able to change. For the client's own protection, I want the client only to be able to change data in the fields that I've designated. This sort of scheme is impossible using a Word document or template. I hope it's possible with a PDF.