We have been working with a designer from the very beginning of our company. She created us the logo and did products design as well.
After a year of first collaboration, we asked her to redesign our portfolio of products (not big changes). She accepted.
The problem is that now when she has to deliver the new work she is talking about IP rights. We really do not know which IP rights is she refering since we do not have any signed contract with her (she never requested it). Moreover, we have been using the logo, products design... in many events and places.
Since we have no contract does she have any right to claim for IP rights (if yes which ones)?
p.d. we are based in Japan. she sent us all the original files (.ai)
Thanks in advance,