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1. Add a column as Starson17 said. This is probably the best way. If your library is huge, it'll be tedious until you get it done, but then becomes negligible for new books. To make this easier, batch-select a bunch of books, press 'e', to edit metadata, click on the 'custom metadata' tab, and set the yes/no for all selected books at once. This is, of course, after you've made the column.
2. Add a tag. Then simply search for 'drm' or 'non-drm'...or whatever.
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