Bruno, we exchanged emails some weeks ago about encryption
And you told me to set it 

writer.setEncryption(PdfWriter.STRENGTH40BITS, null, null,
PdfWriter.AllowPrinting);

So that user will be able to read it right away in adobe acrobat
reader but this will be uneditable. That is right
Problem is there is an advanced pdf password recovery software that
can decrypt it making it editable. The only way to do this is to set a
username and password even at least one character for it not to be
able to be decrypted. Then the problem would be that in adobe acrobat
reader, it asks for a password so it's not viewable directly anymore.

any idea on a workaround for this?

Hope to hear from you soon
Mark

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