Abstract Child protection reform has been difficult, despite evidence that practice should be more child-centred, respectful and responsively inclusive of family communities. An Australian survey 387 third parties working with statutory child authorities revealed widespread support for reform, but significant opposition to authorities. Only police aligned themselves Welfare workers were most li...

abstract: access to exact and reliable information about the land and knowledge of legal situation of land during of transaction is very important. the person that wants acquire a land, he spends charges for achieving of information but sometimes these efforts don’t result to consequence and it is possible that transferee confronts whit person who isn’t owner or who does opponent transactions. ...

In this paper, we consider the scenario where a set of parties need to cooperate with one another. To safely exchange the information, a set of authorization rules is given to the parties. In some cases, a trusted third party is required to perform the expected operations. Since interactions with the third party can be expensive and there maybe risk of data exposure/misuse, it is important to m...