My job requires that I know the region and format (PAL or NTSC) of a large collection of DVDs. Most come with the information, but there are a few that don’t, and a few with the wrong information altogether. Searching for a way to automatically determine this information yielded results for bypassing copy protection or region restrictions, but I wasn’t interested in that. I finally learned that OS X’s DVD player provides that info through the File -> Get Disc Info menu option (or Command+i). The “Info” tab shows the format under the “Video” panel, and the “Regions” tab displays the disc’s region.