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It might have got stuck in BullZip because of the DRM. (Or are we talking merely password protection, here? I'd be very surprised of PDFLRF could handle DRMed PDFs.)
Are you doing nothing but cropping whitespace? If so, then with all due respect to BRISS, which I love, it's not the right tool for the job if you have a lot of files to process, and you're only removing whitespace. Assuming the DRM isn't a hindrance (which it might be), you could use SoPDF or a combination of Calibre and Ghostscript inside a batch file to auto-crop all the PDFs in a folder with a single command. (Let me know if you need details.)
(Keep in mind also that calibre can batch convert LRF to ePub.)
Do you know exactly what kind of DRM this is? Is it just password protection?
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