Could your dad? Could your mom? Neighbour?
Why would they rent software then?
Ofcourse they can. Everything can be cracked.
Sure. But for how long wmv exists? And still nobody can do it... Meaning that it's realatively safe... That means that all is needed is another format of executable (probably interpreted by operationg system itself), built-in licence and internet access.
Not so far away if you ask me...