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EncodePermissions - CanAssemble?

Question

I'm confused - what does CanAssemble do?

"CanAssemble Set this to 1 to allow the user to assemble the document. Only works with 128-bit encryption."

What does that mean, exactly? Assemble what, and how?

Answer

Here a description of the options from the PDF 1.7 Specification

CanAssemble is bit number 11.

BIT POSITION MEANING

1 Reserved; must be 0.

3 (Revision 2) Print the document. (Revision 3 or greater) Print the document (possibly not at the highest quality level, depending on whether bit 12 is also set).

4 Modify the contents of the document by operations other than those controlled by bits 6, 9, and 11.

5 (Revision 2) Copy or otherwise extract text and graphics from the document, including extracting text and graphics (in support of accessibility to users with disabilities or for other purposes). (Revision 3 or greater) Copy or otherwise extract text and graphics from the document by operations other than that controlled by bit 10.

6 Add or modify text annotations, fill in interactive form fields, and, if bit 4 is also set, create or modify interactive form fields (including signature fields).

9 (Revision 3 or greater) Fill in existing interactive form fields (including signature fields), even if bit 6 is clear.

10 (Revision 3 or greater) Extract text and graphics (in support of accessibility to users with disabilities or for other purposes).

11 (Revision 3 or greater) Assemble the document (insert, rotate, or delete pages and create bookmarks or thumbnail images), even if bit 4 is clear.

12 (Revision 3 or greater) Print the document to a representation from which a faithful digital copy of the PDF content could be generated. When this bit is clear (and bit 3 is set), printing is limited to a low-level representation of the appearance, possibly of degraded quality. (See implementation note 25 in Appendix H.)


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