python list by value not by reference

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Let"s take an example

a=["help", "copyright", "credits", "license"]
b=a
b.append("XYZ")
b
["help", "copyright", "credits", "license", "XYZ"]
a
["help", "copyright", "credits", "license", "XYZ"]

I wanted to append value in list "b" but the value of list "a" have also changed.
I think I have little idea why its like this (python passes lists by reference).
My question is "how can I pass it by value so that appending "b" does"t change values in "a" ?"

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