Yes, metadata from the original PDF you upload will be retained as-in in Stamped copies we issue to your buyers. However, document permissions cannot be retained, though you can choose to disable printing and/or copy-pasting content from Stamped copies when you set up our Stamping URL, and our Stamper otherwise applies reasonable default file restrictions, as we explain in more detail here:
This help page explains how to set up PDF Stamping for your product(s):
