In the context of deepening media convergence, the upgrading of knowledge consumption, and the reshaping of competition within the cultural industry, the traditional "content provider" model on which publishing institutions have long relied is facing profound challenges. For traditional publishers, the strategic transformation from content suppliers to builders of IP, or intellectual property, ecosystems has therefore become a core issue related to both survival and future development. Relying on classic IP such as The Smurfs and The Adventures of Tintin, the French group Média-Participations has achieved diversified value extension, spanning from comics publishing to animation, film, games, derivative products, and even theme parks, offering an important reference case for the ecological operation of publishing IP. This paper systematically examines the three-stage path through which Média-Participations has built its IP ecosystem. The first stage is marked by specialized content accumulation and the establishment of a copyright foundation; the second, by cross-media value amplification and industrial expansion; and the third, by ecosystem-based operation and digital integration. On this basis, the paper analyzes and extracts the group's core capability system for IP operation. These capabilities include systematic content incubation and excellent creator relationship management, professional and institutionalized copyright integration and governance, industrialized cross-media development and full-chain collaborative operation, localized market cultivation and channel network construction under a global vision, as well as forward-looking digital transformation and data-driven refined operations. Based on this analysis, the paper further focuses on the transformation needs of professional publishing houses and draws methodological implications for the construction and operation of content IP ecosystems. Chinese professional publishers should systematize IP management and incubation mechanisms, professionalize cross-media development, deepen digital-intelligent transformation, and build user-centered operational systems. They should move beyond single-product publishing logic and build an integrated development model that connects content resources, copyright assets, brand value, user communities, technological platforms, and industrial partners. The paper also proposes an IP ecosystem-building strategy guided by the principles of "content as the foundation, brand as the soul, cross-sector integration as the path, and ecosystem dominance as the goal." In this framework, content remains the starting point and core asset of publishing transformation; brand provides the symbolic identity and long-term value anchor for IP development; cross-sector collaboration opens up new scenarios for value extension; and ecosystem construction determines whether publishing institutions can achieve sustainable growth in an increasingly competitive cultural market. By examining the experience of Média-Participations and relating it to the realistic conditions of the professional publishing sector, this study aims to provide a reference with both theoretical depth and practical value. It argues that the future competitiveness of professional publishers will no longer depend solely on the quantity or quality of published content, but on their ability to transform content into expandable IP resources, convert copyright into diversified cultural products and services, and build a collaborative ecosystem capable of continuous value creation.