Un-Modifiable some Text / some part of FCKEditor

Guys,

Is it possible or is there any add-in in FCKEditor or CKEditor that is useful to make some text part Un-Modifiable like in below image,

Where.. Like EBL:{Blood Loss:minimal} and Fluids {Fluids: none} is Un-modifyable part in HTML. I mean kind of these. Some part of Text is not modifiable. Any one can give me any hint for any plugin like that... Thanks...