1. The full form of KDM is Key Delivery Message

KDM is the acronym for Key Delivery Message. A KDM is required to play an encrypted movie. Each KDM enables one version of the movie to play on a target playback device for a limited duration, which could be hours, weeks, or months.

The KDM is the vehicle for securely delivering symmetric content encryption keys to authorized playback equipment. A KDM targets only one playback device, and is an expression of trust in the targeted device. Further, the trust conveyed by a KDM is only expressed for one encrypted Composition.  Content versions, expressed as a separate Composition, require a different KDM to play it.

Symmetric keys carried by the KDM are encrypted, making the KDM intrinsically secure. It does not rely on a secure transport, such as TLS, to secure the keys it carries. For example, a KDM can be posted on a public web page, with the only possible outcome being that the single device authorized by the KDM will be capable of playing the associated content in accordance with the conditions carried in the KDM.

It follows that trust is expressed at the time of creation of the KDM, and not in the distribution of the KDM. This reduces the distribution of the KDM to a matter of pure logistics, without concern for the security of the transport mechanism. If a KDM arrives at the wrong destination, for example, the security of the Composition it addresses will not be compromised.

2. The full form of KDM is KDE Display Manager

KDE Display Manager (KDM) is a display manager (a graphical login program) developed by KDE for the windowing systems X11.

KDE Display Manager is based on the source code of X display manager  and was the default display manager of the KDE Software Compilation, until it was retired in KDE Plasma 5 in favor of SDDM.

KDM allows the user to choose a desktop environment or window manager at login. KDM uses the Qt application framework. It is configurable via KDE’s System Settings; its appearance can be customized by the user.

The default KDM login screen has a list of users. Each entry comprises the user’s username, personal name (if available), and an icon. Next to the list is a greeting and a picture. One of the customization options is to replace the picture with an analog clock. From this screen the user can also run a user management tool, shut down or reboot the computer, or restart the X Window System.

3. The full form of KDM is Knowledge Discovery Metamodel

Knowledge Discovery Metamodel (KDM) is a publicly available specification from the Object Management Group (OMG). KDM is a common intermediate representation for existing software systems and their operating environments, that defines common metadata required for deep semantic integration of Application Lifecycle Management tools. KDM was designed as the OMG’s foundation for software modernization, IT portfolio management and software assurance. KDM uses OMG’s Meta-Object Facility to define an XMI interchange format between tools that work with existing software as well as an abstract interface (API) for the next-generation assurance and modernization tools. KDM standardizes existing approaches to knowledge discovery in software engineering artifacts, also known as software mining.

4. The full form of KDM is Korean domestic market

The Korean domestic market or Korean domestic motors (KDM) is the name for South Korea’s economic market for domestic-brand goods, chiefly automobiles and parts. South Korea’s main export markets are the United States and Canada. While the United States often uses an original equipment manufacturer (OEM) for assembly, the KDM makes all its products under their own brand.

5. The full form of KDM is KDM Shipping

KDM Shipping is a holding company based from Cyprus.

The company consists of the KM Management (Cyprus),the Communal shipping company “Kiev” (based in Kyiv using the Dnieper River and the Black Sea), the “Capital Shipping Company”, the Kyiv River Port, the Kherson Shipyard of Kuibyshev.