Hi, I have a small suggestion here:
When you remove a pdf's encryption, pdf shell tools generates a new file without encryption. These files do appear with a lock (see attachment) in windows explorer. This is, as far as I can see, not a big problem, but kind of an annoyance, at least for me. The reason for the lock is, to the best of my understanding, that pdf shell tools gives the new file standard security settings (rights for system, administrators and the user), while all other files in that folder have inherited security settings in my case.
I thus propose that pdf shell tools takes over the security settings of the encrypted pdf file.
Best
Philipp