I think you should take a couple digital pictures of the phenomenon that you are seeing (2 examples) and post them. Also, inspect the Staples DVD case and see if you can find the manufacturer's name and any other ID codes. You might be able to contact the manuf. directly about your questions. On the other hand, if their case doesn't conform to DVD case standards, they may avoid your questions and hope that you remain quiet. Most of this stuff is made in China or Taiwan, so inherently they tend to avoid answering people. Or, take it up with Staples, and make them scared that they will be liable for huge damages from thousands of angry consumers. But only do that if your observed phenomenon is a serious long-term problem, and not harmless to the DVD. Currently, I keep most of my burned DVDs in a Case Logic binder in the soft sleeves. I could be wrong, but I think this is fairly safe because it keeps them out of sunlight, minimizes air availability, and doesn't stress them against the plane of the disc.