Dear Colin, thanks for your reply. I have tried to implement what you explain but it doesn't seem to work for some reason.Not totally at least. I have many categories (of the Register-cat type of your example) within JD, whose files should only be downloadable from Author users. What I am realizing is that the single files within each category have, for some reason, a 'deny' on the author property (and on others as well). After I change this immediately the file is downloadable. So the scenario that I have in front of me is that I will have to go to each file, one by one, and change those permissions. So now the question is how have these files received a 'deny' value in the first place since I don't think I put it. And is there a way to change the download permission to all of them in one go?