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Multiformat is unencrypted/non-DRM'd. The ebooks may have printing/read-aloud turned off in their settings, but should be convertible to other formats without those restrictions. Multiformat PDFs are locked to prevent editing (and read-aloud etc.), but there's software available that will remove the lock.
I don't believe PalmDOC PDB can have that kind of restrictions. And some of them only have them "disabled" because the software that reads them, doesn't have any kind of read-aloud or print function. (.RB and .IMP don't have read-aloud software.)
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