Quote:
Originally Posted by Justin Nemo
OK I opened a PDF in Adobe Acrobat Pro. I secured it with a password and saved it. I took it in to Calibre version 0.8.43 and converted it to mobi format and loaded onto my Kindle. You had me going there for a minute. 
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Did you enter the password into calibre? If so, how? If not, how do you think the password protection was defeated? If you tried to open the original PDF in some other PDF viewer, did you get a warning that the file was password protected and couldn't be viewed?
When I try to do that, I get a big
"Cannot convert password.
This book is locked by DRM. To learn more about DRM and why you cannot read or convert this book in calibre, click here.
A large number of recent, DRM free releases are available at Open Books."
dialog.
I suspect that you did not correctly apply a password that encrypted the contents of the PDF, or you accidentally imported the non-drm version, or you have previously imported the non-drm version, and then imported the drm version, thinking it would replace the earlier copy (it doesn't).
Calibre does not contain any DRM removal code, nor can it view or convert password protected PDFs.