@Edent if I had to guess, it probably broke the security model in some way. Seems like it got removed in Android 5 (Lollipop) based on some searching.

That said, I'm curious how the security model has improved and if widgets are "read-only" from a permissions perspective. I don't think we'd want a widget to enable changing something in the phone while it remains locked.

As always, folks, be vigilant about what you put on your lockscreen.