If you do apply labels, research the type of adhesive used. Some are less “archival” than others. Another consideration re: labels is that many of these can cause problems for DVD players. The labels s/b as thin and light as possible and very carefully centered. We recently switched from writing on our circulating DVDs (hard to read, hard to keep ink away from the readable sections) to thin labels similar to Gaylord’s polypropylene labels w/acid free adhesive (http://www.gaylord.com/adblock.asp?abid=17823&search_by=desc&search_for=dvd%20labels&mpc=WW). So far we haven’t had any problems or complaints. We get them from a different vendor because we want the barcode system to match the ones we use on other items.