This is due to two problems.
''Adobe Acrobat DC was unable to make this document accessible because of the following error:
Bad PDF; error in processing fonts. <unsupported Type2 font> 
Please note that some pages of this document may have been changed.
Because of this failure, you are advised to not save these changes.''
the other problem says
YOU CAN NOT EDIT THIS FILE AS A FORM DUE TO ITS SECURITY SETTINGS
But I have checked the security options (as advised by internet help) and all of this is unchecked.
I'm going mad!!
I've spent 2 days going round in circles taking advice from all and sundry on the internet.
I am using Adobe Acrobat DC and Adobe Indesign 2015
Any advice will be greatly appreciated.
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Are you creating the form from scratch or are you trying to modify an existing from?
Based on the message about security settings, it sound like this form has had "Extended Reader Forms Rights" applied and you have not saved it in a manner to remove these extended rights.
I'm back to making interactive forms again and still having the same problems.
Thank yo so much for replying to me. I'm afraid I've only just read your reply.
I am designing a form in Indesign from scratch, then exporting the doc to a PDF. Then I simply want to open in Acrobat Pro and 'prepare a form'.
This is where i get the ''Bad PDF, unsupported True type font'' message.
Do you know what I am doing wrong?