Because the public cloud model is available to everyone, in most instances all a customer will need to do to gain access is set up an account and provide a credit card number through the service's web portal. No additional contract negotiations, agreements, or specific group memberships are typically needed to get started.

Whereas IRM is used to protect a broad range of data, DRM is focused specifically on the protection of consumer media, such as publications, music, movies, and so on. IRM is used to protect general institution data, so financial records, personnel data, and security profiles would all fall under the auspices of IRM.

Explanation
Cloud environments are constantly changing and often span multiple physical locations. A cloud customer is also very unlikely to have knowledge and insight into the underlying systems architecture in a cloud environment. Both of these realities make it very difficult, if not impossible, for an organization to provide a comprehensive systems design document.

Explanation
Popular services such as iCloud, Dropbox, and OneDrive are all publicly available and are open to any user for free, with possible add-on services offered for a cost.