I would say that ad. lib in a piece of music is saying "feel free to improvise at this point" (but only if you feel like it). It it encouraging (not forcing) you to put your personal musical stamp on it. So the ad. lib part is only really "fixed" by the artist if you want it to stay as the original. What you do and how much you wish to change it from the orginal music is completely up to you (but may also depend on the skills and experience you have as a guitarist and what you feel comfortable with).
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