I have created a fillable PDF but I need a way to have my client lock the form after they fill out and sent it back to us. (this way they can't say we changed something) How can I do this that non-computer people will understand? a button they push after filling the form out?
The only safe way of doing that is to digitally sign the file. You can add the signature field to it before sending it to them. Then they would only need to click it and follow a simple dialog to have it signed. You can define the signature field in advance to lock all the fields in the file (via its Properties, under the Signed tab).
The signature can then be validated (using a public key), in case of any doubts that the file was edited after the signature was applied.
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