What is the difference between legal possession and possession?

The reason why this example is not established is not the concept of possession, possession and control. The reason why supermarket employees can't claim the lien on supermarket goods is because the occurrence of lien is related to the subject matter and creditor's rights (causing lien). Obviously, for the employee, the labor contract relationship between him and the supermarket (strictly speaking, it is not a civil law creditor's right relationship) cannot be the reason for claiming lien.

As for control, possession, possession. Possession is a proprietary concept in property law, which refers to the state of control and domination over things in fact. Including legal possession, illegal possession, entitled possession and unauthorized possession. Therefore, conceptually, possession includes possession and control, but the expression of possession focuses on the behavior itself, which is mostly used to express intangible rights, such as the patentee, while control focuses on the dominated situation, such as the actual control of the object in litigation.