Document pseudonymization for AI assistants: sending the spreadsheet without sending the customers

To prevent sensitive data from leaking into AI prompts, companies must pseudonymize documents before sending them to AI assistants. This involves replacing sensitive values with plausible surrogates through a bijective mapping kept locally. The mapping file never leaves the machine, and original data can be restored exactly. This approach is necessary to comply with GDPR and trade-secret protection. Companies must implement pseudonymization to balance AI productivity with data security.