A key component of Platform Governance (i.e. the management of the infrastructure and related services) on SharePoint is the understanding of security and how that affects user collaboration. Here’s a webcast I attended as a guest speaker concerning security challenges through SharePoint collaboration. Please note, this is high level, and not technical.
As you can appreciate also this subject is vast; in fact I blogged about Consumerization of Mobile Devices and how in terms of Security this affects the use of SharePoint here.
Anyway, here’s the Webcast – Enjoy!