I am looking for a hybrid of the password field and the text field. Would it be possible to (maybe add a filter or custom attribute) so that the admin input obfuscate the value entered by the user but, on save, does not encrypt the value in the database? That would make it a little bit harder to store license keys in the admin. They are plainly readable in the database, sure, but they are not readable to a normal user while inside the WP admin. I could see this either being a modification on the password field to not encrypt the value or on the text field to obfuscate the value entered.
Is there anything out there right now to satisfy my requirements?