When you have to translate documents with sensitive data (like court orders, contracts etc.), you may want to prevent to get these data out of your office while still be able to use Machine Translation (MT).
Perhaps the procedure described here, can provide a solution (please write your views as a reply).
Example source document:
First hide all sensitive data in MS Word (see attached document).
When you start a new project, make sure that all MT engines (like MyMemory) are not selected in the Dashboard:
Here's the document loaded in CafeTran, you can see that the hidden data are not displayed (and thus not sent outside). You could still use MT.
When an MT engine like MyMemory is active, click on the tab with the right mouse button and close the tab: