We have a form that we need updated once a calendar year. We have been using fillable pdfs but notice people are reusing the form by changing the date only even though we need fresh information every year. My question: "Is there anyway to lock the date field so once completed, it cannot be revised/edited"?
You can set it to read only in field properties 'General' tab. But anyone with acrobat pro can just uncheck it (but not with reader, I believe). You can use script to keep it read only, it would be a little more difficult to bypass it if they don't know how to delete script from the file.