A database access management entity, DAME, comprising: communication circuitry to receive a request to access information from one or more distributed databases for shared spectrum in a wireless communication system; and one or more processors coupled to the communication circuitry to: determine a level of knowledge of an initiator of the request, the level of knowledge corresponding to an incumbent user's use of the shared spectrum; and based on the level of knowledge, determine a subset of information, the subset of information being a subset from the information requested to be accessed, from the one or more databases to provide to the initiator of the request so as to assist the initiator to access the shared spectrum when not in use by the incumbent user (242; 244; 248; 252); characterized in that the level of knowledge of the initiator of the request is allowed to be higher for tier-2 users having priority access in a spectrum access system, SAS, case or licensed shared access, LSA, case as compared to the level of knowledge allowed for tier-3 users having general authorized access in the SAS, the grant of the subset of information is to protect one or more of the tier-2 users or the tier-3 users from the incumbent user's high-power emissions and that the one or more processors coupled to the communication are further to: transmit, through the communication circuitry, a grant of the subset of information to the initiator of the request, determine that the incumbent user's high-power emissions exceed a predefined threshold; and in response, push an updated subset of information to the initiator of the request to protect against the incumbent user's high-power emissions. communication circuitry to receive a request to access information from one or more distributed databases for shared spectrum in a wireless communication system; and one or more processors coupled to the communication circuitry to: determine a level of knowledge of an initiator of the request, the level of knowledge corresponding to an incumbent user's use of the shared spectrum; and based on the level of knowledge, determine a subset of information, the subset of information being a subset from the information requested to be accessed, from the one or more databases to provide to the initiator of the request so as to assist the initiator to access the shared spectrum when not in use by the incumbent user (242; 244; 248; 252); characterized in that the level of knowledge of the initiator of the request is allowed to be higher for tier-2 users having priority access in a spectrum access system, SAS, case or licensed shared access, LSA, case as compared to the level of knowledge allowed for tier-3 users having general authorized access in the SAS, the grant of the subset of information is to protect one or more of the tier-2 users or the tier-3 users from the incumbent user's high-power emissions and that the one or more processors coupled to the communication are further to: transmit, through the communication circuitry, a grant of the subset of information to the initiator of the request, determine that the incumbent user's high-power emissions exceed a predefined threshold; and in response, push an updated subset of information to the initiator of the request to protect against the incumbent user's high-power emissions. determine a level of knowledge of an initiator of the request, the level of knowledge corresponding to an incumbent user's use of the shared spectrum; and based on the level of knowledge, determine a subset of information, the subset of information being a subset from the information requested to be accessed, from the one or more databases to provide to the initiator of the request so as to assist the initiator to access the shared spectrum when not in use by the incumbent user (242; 244; 248; 252); characterized in that the level of knowledge of the initiator of the request is allowed to be higher for tier-2 users having priority access in a spectrum access system, SAS, case or licensed shared access, LSA, case as compared to the level of knowledge allowed for tier-3 users having general authorized access in the SAS, the grant of the subset of information is to protect one or more of the tier-2 users or the tier-3 users from the incumbent user's high-power emissions and that the one or more processors coupled to the communication are further to: transmit, through the communication circuitry, a grant of the subset of information to the initiator of the request, determine that the incumbent user's high-power emissions exceed a predefined threshold; and in response, push an updated subset of information to the initiator of the request to protect against the incumbent user's high-power emissions. transmit, through the communication circuitry, a grant of the subset of information to the initiator of the request, determine that the incumbent user's high-power emissions exceed a predefined threshold; and in response, push an updated subset of information to the initiator of the request to protect against the incumbent user's high-power emissions.