I have one PDF that is triggering that message. It does have security, but the properties show it allows reading without the password. The device I tried it on has been activated. And, as I hadn't put an book on it from ADE for a long time, I used that to check that the it was authorized properly.
The other PDFs all seem to be OK. None have any security and were sideloaded from calibre. I havn't tried the one that isn't working for a while, so I don't know if it is a recent change or not.
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