Why can't I add bookmarks to my PDFs?

[Hakkonen]

No, seriously. The core PDF is severely lacking in bookmarks, but I am inexplicably prevented from creating new ones. Who do I need to slap?

[Moppy]

Usually it's because the PDF creator chooses to lock the PDF to protect it from editing, and you're probably using software that respects or can't bypass the lock.

I can't remember what I've installed on Ubuntu to read PDFs. It can't unlock a PDF, but it can read the file contents, add a bookmark, re-save it and delete the original. Which is effectively the same thing.

[Hakkonen]

Editing bookmarks really ought to be allowed, even if editing the content is otherwise verboten.