The last sentence of the quote from Jonathan Herbach at Adobe really sums up Quest's strategy nicely:
Our customers need to know that they have more secure and compliant access to the documents we help them manage, and they want this access without the need to manage multiple identities and access roles across their heterogeneous environments," said Jonathan Herbach, product manager for LiveCycle Rights Management at Adobe. "With Quest's single sign-on technology included in the LiveCycle suite, we can offer our customers increased security without implementing more infrastructure."
Without implementing more infrastructure - aka, yet another directory service.
ADBE, QSFT, Quest Software, Adobe, identity management, Active Directory