I need a method for embedding and extracting large strings of arbitrary data within a PDF document. Is it possible to repurpose an existing metadata field, and if so, which one is best? Or is there another way to store/extract non-displayed data within the file?
Some details:
- I'm currently using DOMPDF to generate the PDF documents (from form data).
- The data strings are serialized->encrypted->base64.encoded form data.
Here's a plain text example of the sort of string I need to embed/extract from a generated PDF document.
I'm aware of this post and the $dompdf->add_info() method. What I'm asking is whether or not I can use a DOMPDF-supported metadata field to store and extract a large string, or if there is an alternative strategy altogether.
