Your code is not the only thing leaking into AI prompts. The Excel file with your customer list, the Word contract, the HR email thread — those go too. Here's how to let the AI work on them without a single real name leaving the machine.

The request that started this

The pattern shows up in every company that adopts AI assistants, usually within weeks:

"Can you summarize this contract?"

"Clean up this workbook and add a total per region."