I'm a small business owner and would like to streamline the collection of sensitive data, such as social security or tax numbers for tax-related tasks. While Adobe Sign has some great password protection features, concealing a specific field would be especially powerful to protect the signer's sensitive data. Based on my conversation with a customer service rep at Adobe, this feature isn't available. The only other alternatives are to set a password for viewing, editing, and setting a password once the signer has signed to lock the document.