There is a bug in exporting a protected PDF to iOS Adobe Acrobat Reader. If I put a password protection for printing, text editing and content coping in the PDF, the Acrobat Reader on iOS can't show the file. The app crashes or every (!) page needs between 4 and 7 minutes to show up. Within this 4-7 minutes the page is simply grey or white. If I export the same InDesign document without password protection, the iOS Adobe Reader shows it perfectly and normal. As a workaround I exported it without password protection, opened on the Mac in Acrobat Pro, added here the password for editing, printing and coping - same result, it doesn't work. All systems (macOS, iOS, iPadOS as well as the Adobe Reader) are running on most actual versions. Please fix this asap, I need to deliver this file. It may can be also a bug in the iOS Adobe Reader, because Acrobat Pro on the Mac as well as the macOS preview shows it perfectly.