Sometimes the developers just include into their software something that is there not the user's sake. Which ends up Interfering with user's needs. And it's just plain annoying.
This comment thread is for people to document various implementations of this malicious feature.
Digital Restrictions Management or DRM is any software functionality that is designed to prevent you from using the files on your computer the way you want to use those files. This is obviously a malicious feature. And is defective by design.