Abstract: We studied an imperfect quantum sealing protocol, and provide an inequality based on the readability which Bob could measure the information and the security which Alice could detect the information to be measured. The results show that, when the security β is not greater than 1/2, the sum of readability α and security β is not greater than 9/8. As an illustration, we give a example to prove our inequality.

Key words: quantum optics, quantum seal, readability, security