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Sharpies won't hurt DVD's unless you write on the data side. Once the alcohol dries in a few seconds only dye is left behind. The story started with CD's which have their reflective surface at the top of the disc. Ball-points or even some alcohol/ink pens can affect the back side of that ultra-thin layer on some percentage of cheap discs. DVD's are different. They have a >.5mm layer of plastic between the top surface and the data. You could use a knife to etch your titles and not affect playback.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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