Using LiveCycle I created a form with expanding text fields and saved it as a PDF. I enabled user rights in Acrobat. It opens/works fine with Reader on Windows 7. But I cannot open the form using Acrobat DC on my iPhone. I have an Acrobat DC for Windows subscription and signed into Acrobat on my iPhone. But I get this error: "This form requires adobe acrobat reader dc for mac or windows." Is the problem that I need a subscription for Acrobat on Mac?