Requirements for PDF as container for VC's

Kicking off some discussions here – I’d like to start by putting down what I think are some “primary” requirements for the use of PDF in this context.  Am I missing anything?  Do you disagree with any of these?   Feedback welcome!!

## Requirements

- Shall store the VC in native JSON-LD (w/optional compression)
- VC should be in an easily accessible location (for both reading & writing)
- Should require no language changes to PDF (except "metadata"-like values)
    - implies compatibility with both PDF 1.7 and 2.0
- Shall be usable in conjunction with standard PDF Signing/Certification


Leonard