Rübig is an active member of the Committee on Industry, Research and Energy and has supported SME participation in EU projects, including the Seventh Research Framework Programme and the Competitiveness and Innovation Framework Programme.
As a Member of the European Parliament MEP) since 1996, Rübig has repeatedly called for a reduction in the cost of patenting for SMEs and fair access to jurisdiction, championing alternatives such as mediation and arbitration. He was involved in the Doha Round discussions at the World Trade Organization, taking a keen interest in trade-related aspects of intellectual property.