How do you I enter script text into a Rich Text field without it changing the text?

How do you I enter script text into a Rich Text field without it changing the text?

I'm tracking XML data feeds and when I copy the feed script from my XML document into my records Rich Text "Details" field, update the record, and reopen the record, the script is treated as if it were meant to be performed and is executed within the field. I just want whatever is entered into this Rich Text field to be left alone and look exactly the way I left it.

Example:
Original copied text...
<name>
John
</name>

Text after update...

John


Please assist. Thanks!
Brent