Doujin animation referred to manga, novels, games, and other works created by different authors or creative teams. They were based on the original works and added their own original elements. The intellectual property rights of Doujin animation involved the following aspects: 1. The issue of copyright: Doujin animation is based on the original work, so the copyright belongs to the original work's copyright owner, which is the animation production company or the original author. Doujin animation production companies needed to obtain permission from the copyright owner of the original work or they might face the risk of copyright disputes. 2. The ownership of intellectual property rights: In Doujin anime, the intellectual property rights of the original creator and the original author may overlap to a certain extent. For example, when the original content appears in the original work, the intellectual property rights of the original creator may be violated to a certain extent. Therefore, when creating Doujinshi anime, it was necessary to abide by the relevant intellectual property laws and regulations to ensure that the intellectual property rights of the work were fully protected. 3. Infringing accusation: If the original creator of a Doujin anime finds that his work has been used by others without authorization, he may sue the violator and ask the violator to immediately stop the act and compensate for the losses. 4. Protecting intellectual property rights: Doujin anime creators can also protect their intellectual property rights through legal means, such as filing a lawsuit in court or seeking legal assistance. Doujin animation's intellectual property rights needed to be jointly maintained by creators and copyright owners to ensure the legitimacy of the work and the full protection of copyright.