What you will need will depend on the jurisdiction, however, even if there is an implied transfer, you should put in place a full written agreement. This will d

What you will need will depend on the jurisdiction, however, even if there is an implied transfer, you should put in place a full written agreement. This will deal with: - assignment - further assurance (so they will sign other docs if necessary to perfect the assignment) - warranties as to the quality of the IP and their work - indemnity (if you get sued for using their IP, you can claim against them. - insurance (so they can afford to pay under the indemnity if necessary). You also need to be wary of incorporation of third party code into their work and if this is the case, you will need appropriate rights to use the third party code.