The command "ip ospf database-filter all out" under interface works like passive interface does in distance vector protocols. When you say 'passive interface' in OSPF, you deny sending any hello packets out an interface, therefore an adjacency cannot be established. With 'ip ospf database-filter' on the other hand, you are only filtering the LSA generation. This means that you can still establish adjacencies (since hellos are still sent), but you won't send your neighboring router any LSA's. Therefore you will receive all the LSA's in their database, but they will not receive any of yours.
Neighbor ip-address database-filter all out-To filter outgoing link-state advertisements (LSAs) to an OSPF neighbor
Ip ospf database-filter all out-To filter outgoing link-state advertisements (LSAs) to an OSPF interface
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