Locked PDF

[concreteok]

Would like to ask around, any of the users have a way to open those locked PDF like this one

Code:

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Many thanks in advance.

[3fan]

Is not a lock pdf. Is a pdf which redirect the user to amazon site. Maybe the format is for electronic reader devices (kindle).
I have already checked it.
Regards
3fan

[daywalker]

This pdf file needs to be digitally verified from Amazon.com. File can only be readable with digital certificate. The other name is digital rights management (DRM)
check this out.

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Regards

[bigone]

the best program for
remove DRM from eBooks Adobe Digital Editions

Code:

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