I put the date in the title in case someone else is searching and gets as frustrated as I am trying to find what is current. In the SDK docs, it says Adobe maintains a registry to assign your prefix, but has no link or other info. I did some searching and found this:
It's a few years old. I sent email to the address mentioned and didn't get a bounce but haven't received any response either. Is that current? If not, what is?
I think it's unlikely that the InDesign registry team would assign PDF or Acrobat IDs.
OK. I got it from searching for ID assignments from Adobe. Do you have any idea who would assign them?
If by "prefix" you mean a second-class name prefix for PDF names (according to ISO 32000-2, Annex E.2), you will find the current prefix list and instructions for creating one at https://github.com/adobe/pdf-names-list
If you mean a different kind of prefix, please clarify.
It's different; not in a document name but in dictionary item names inside it so that plugins can store data without name collisions.
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I did get a response and a range of IDs assigned late Friday. Response was from Adobe Enterprise Support. Makes sense for it to be a central registry across all things Adobe.