How to use copy text protected PDF

Hi,
I am a paying trial user but because at the moment the I can’t login in my account in the official forum, that isn’t working and I don’t know way, I decided to write my question here hoping to have an answer. I need to use a PDF with disabled copy function because I need to protect the text in the PDF. I created PDF where all the changes except fill the fields and sing the signature fields are protected (this would be the best solution for me) by password but this PDF doesn’t work with formidablePRO2PDF. I created also a PDF with only text and image copy protected by password but also this doesn’t work with formidablePRO2PDF. Booth the PDFs that I created are with compatibility from Acrobat version 3.0 and above and can be opened without password. Can you please tell me how can I create a PDF, at least, with copy text function disabled that can work with formidablePRO2PDF? Or can you please add a function that disable, at least, the copy function in the created pdf leaving the ability to sing the signature fields present on the PDF produced? Thank you in advance for any help.