Answer:
Digital Rights Management software is software that installed in the "middle" of a software application or "stack" of software to limit your ability to make something work. It is frequently used to limit your access to music and video data files.
Such software is usually "proprietary" meaning owned by one company, and is usually incompatible with all similar software. The operation and design of such software is usually guarded to be sure that your access remains limited.
For any specific device, you will have to search on Google or another search engine about the specific device. The software will frequently have a name that is the opposite of its function such as "always plays"