How to bulk update the copyright message that appears on top of each file in Xcode?

I've visited Change templates in Xcode , but I don't think it is exactly what I want to do.

Xcode adds a copyright message to the top of each file that you create and populates it with fields like name, copyright etc, which it reads from somewhere.

I want to know: 1) How to bulk change the copyright message on files that have already been created. 2) Change the settings, so that for new files it specifies different name / company in template.

Solution

1) find and replace :(

2) the name and company are taken from your card in the Address Book app.