Nah impossible
He really wanted to keep this uneditable, it would take a lot of time to compile this xD
To make you understand this better:
In every cleo script there are the labels, in which you put code in them.
You make a label by putting ":" and then a name
Now, the script can be compiled with sampfuncs, which means that if you put at the start of the script "thread" and a name and you compile it, this name will go to every single label on the script with a random number.
If this thread name for example has a character "$" then the whole thing will get fucked because such symbol isn't supposed to be on a label.
So basically this is an effective way for locking scripts