PDF AES encryption ?

To be more specific, I want to make sure that the images embedded in the pdf (currently jpeg and/or png via AddImageFromFile) are duly encrypted within the PDF file.

My understanding is that these files were  embedded as-is. Has this changed ? Is quickpdf embedding those pieces "as-is" or encrypted? 

Hello Ingo,

Thank you for your input. I take it that only the base document is currently encrypted excluding files embedded with addimagefromfile() and embedfile() function.
 
I am certainly no pdf-format guru. But my understanding was that the document was - at least in current versions possibly starting with version 7 - fully encrypted including attachements. That is what I grasped from the text below concerning encryption scope on recent versions. Am I wrong? 

Can we expect more complete AES encryption later this year when debenu starts coding their AES-256 support. I'd be glad to hear that quickpdf-generated documents could behave like Fort Knox once a long enough password is devised:)

http://help.adobe.com/en_US/Acrobat/9.0/Standard/WSD012A4E1-51D1-4bcd-BA9F-EF03C6F20BB6.html

"Encrypt All Document Contents

Select this option to encrypt the document and the document metadata. If this option is selected, search engines cannot access the document metadata.

Encrypt All Document Contents Except Metadata

Select this option to encrypt the contents of a document but still allow search engines access to the document metadata. This option is available when you select a compatibility to Acrobat 6.0 and later.

Encrypt Only File Attachments

Select this option to require a password for opening file attachments. However, users can open the PDF without a password. Use this setting for security envelopes. This option is available when you set compatibility for Acrobat 7.0 and later."