Intellectual Property rights are expanding and, thus, overlapping more
than ever before. This poses challenges to a system devised as
comprising a set of isolated compartments, each with its defined
purpose. The diverging rules concerning ownership and entitlement can
lead to different rights on the same object being owned by different
persons. What happens then? This question is addressed under European
law, focusing on the existing corpus of EU primary and secondary
legislation and jurisprudence and the national laws of France, Germany
and the UK. Five specific cases are considereded: trade marks and
designs, trade marks and copyright, designs and copyright, data-base sui
generis right and copyright and copyright and patents in the field of
computer programs. Some solutions to the problem, namely convergence of
ownership rules, avoidance of overlaps, prevalence of the closest
regime, abuse of rights, implied licences, and expanding copyright
solutions by analogy, are analysed.