Security scoped bookmark
A way to work with user files and folders. (Implementation detail)
A security scoped bookmark is a bookmark to one of your files or folders, that can be persisted. A bookmark can only be created with direct user interaction in file dialogs or via drag and drop. In Foldie you create them in the Base Folders and Base Files section.
A bookmark is valid, if it can be resolved. This is usually the case, if the bookmarked file or folder is not moved or modified. In some situations the bookmark stays valid, even when you modify or move the underlying file or folder (but not both).