Legal analysis: As long as you can prove that the packaging is your design, others may infringe your copyright. If you are the outer packaging of a well-known product, others may constitute unfair competition.
Legal basis: "Interpretations of the Supreme People's Court on Several Issues Concerning the Application of Law in the Trial of Patent Infringement Dispute Cases" When the people's court determines whether the designs are identical or similar, it shall base on the authorized design and the accused infringing design. Design features are comprehensively judged based on the overall visual effect of the exterior design.
Article 69 of the "Patent Law of the People's Republic of China" has manufactured the same product, used the same method, or has made necessary preparations for manufacture and use before the date of patent application, and only in the original Continued manufacture and use within the scope will not be deemed as infringement of patent rights.