Access control for a collaborative business environment not only needs to manage resources of individual collaborator but also needs to integrate, dissociate collaborating domains users & resources, on-demand. As inter-domain transactions are carried out over the Internet, the transactions need security & privacy. Interoperability mechanisms fall short to comprehensively achieve security & privacy in a manner that is scalable, dynamic, autonomy-preserving, and tractable in ephemeral collaborations; thus risking the manageability and security of overall environment in practice. This book...