1. Watermark mark: add a watermark mark to the copy, indicate the purpose of the copy, and prohibit other uses.
2. Encrypted copying: Encrypt the ID card information to be copied with special software, and only people with decryption authority can view the complete information.
3. Write on the back of the paper: Write the purpose of copying and the rejection statement on the back of the paper where the ID card is copied.
4. Signature and seal: sign the copy and affix the private seal or official seal to prevent it from being abused by others.
If the above methods still can't solve your problem, I suggest you report the case to the public security organ to safeguard your legitimate rights and interests.