Even though I have a valid Adobe Acrobat Pro DC account, when I try to protect a PDF document with a password against editing (File-Protect using password), I get a message prompting me to "Subscribe to Acrobat DC (Buy Now!)". When I open my file using Acrobat Pro DC, the only option to prodect my document is from opening, not editing. Isn't "Acrobat Pro DC" suppposed to be superior to "Acrobat DC" and offer more options, not less? Help!!!