Can posting at the entrance of the community to prohibit non-owners from entering the community have legal effect?

There are no laws and regulations, which generally belong to the requirements of property companies.

1. Does the property seal have legal effect?

No. Only administrative law enforcement organs and judicial organs have the right to affix seals. If it is stamped by the law enforcement department, it has legal effect. But the property is not a law enforcement agency.

However, the nature is different. The seal of administrative organs is mainly the condition of fixing property or place (equivalent to fixed evidence), while the seal of judicial organs is a kind of power restriction. In any case, no one is allowed to tear up the seal.

The function of the administrative organ's seal is to fix the evidence for investigation and evidence collection. There is a time limit for investigation and evidence collection. When the evidence collection is completed or the time limit is up, it should be unsealed. The seal of the judiciary is a power constraint, and there is also a time limit, but the time can be very long.

Extended data:

Community refers to a large residential area with relatively independent living environment in a certain area of the city, equipped with complete sets of living service facilities, such as commercial outlets, schools (kindergartens) and so on.

Neighborhood and residential areas are generally called "residential areas", which refer to residential areas, garden houses, residential groups and non-residential houses with corresponding public facilities.