I just bought a used MK3 and it all works as I had an MK2. The previous owner didn't know if he had anything he needed to transfer and since it all works, I cannot really see if I'm missing some licenses if I at a later point want to sell either the MK2 or the MK3.
What should be the basics when getting the hardware? I expect the Maschine 2 software could be required , but am I then able to have two licenses for this software (one for MK2 and one for MK3)?