Hi anon441204.
I’m no expert in PTXprint, but I’ve played around with it a bit. You can adjust the copyright info to your liking. If you toggle the advanced settings, at the bottom of the page…
…then you can go to the ‘Basic’ tab and under copyright, you can type whatever you’d like there.
Sorry I can’t help with the error messages right now. I have often had many error messages, some of which don’t prevent the draft from printing, but some that do.