Legal source defense can still make users bear reasonable rights protection expenses.

If the patentee claims that the user of the infringing product has established a legal source defense, it shall bear the reasonable expenses of rights protection, and the people's court may support it. When the infringer defending legal sources and other infringers are defendants, we can comprehensively consider the damage caused by their respective infringements, the causal relationship or correlation with the patentee's rights protection behavior, whether it hinders the smooth development of the patentee's rights protection behavior, whether it leads to an increase in rights protection expenses, and other factors to determine the sharing of reasonable rights protection expenses.