It seems that when an author creates a PDF and locks it, the allow highlighting and bookmarking are not a separate item. You should separate this so that it can be a more enjoyable read for the reader. I bought a book. I want to highlight and bookmark the parts that are important to me. The owner said it's a security thing and if he locks it, then that's it, no kind of editing can be done. I don't consider highlighting and bookmarking an edit since the original item will not be changed. You have taken away from my enjoyment of reading by putting highlights and bookmarks in a locked category. Allowing this is not a security issue and should be changed in an updated. I'm sorry people steal stuff and make you spend money on locking the books so extreme that you take all the joy out of reading electronic books instead of making my enjoyment the same as if I was reading a paperback. So if the author is wrong and you do have a way of doing it, let me know so I can teach him. But I know this had to be allowed in the past since I know I have bought other books many years ago and highlighting was allowed, so, please bring it back.