PDF in word order is locked, could you please elaborate this a bit more?Are you trying to convert a pdf file to word document?
I assume the pdf file that you are trying to create a word document from a pdf file and the conversion isn't going through.
If this is the case then, there is a possibility that the document is secured and the changes to the document are restricted.
Right click on PDF>Documents Properties>Security
Try with a different pdf and see if that's allow the conversion? Also, refer to Using Adobe Export PDF