Install Unity Web Player without user permission

Questions & Answers
1

Yesterday I found a little Unity Web Player Game called Testa Cursus and I tried it in a CPU with no Unity. For less than a second appears the “Get Unity WebPlayer” button, but then an interface appears and installs the web player without asking anything to the user. I could play it after a few seconds,without, I repeat, doing anything more than opening the webpage.

Well, I’d like to catch this for future developments. I looked everywhere for information about this, but vainly. ¿Does anybody have any knowledge about this?

2

I’ve seen similar, but only due to the button showing even though player was already installed. It sometimes takes a moment to check for the installation. Unless you are completely sure (try uninstalling it and playing the same game for instance) then this is probably what happened.