Creators and updaters shall always create permissions for files within the DICOM File Set such that all users may create, read, write and delete all files, and all users may access, create, modify and delete all directories on all systems.
Notes: 1. These requirements are equivalent to setting a Unix permission of 644 for files and 755 for directories.
2. The intent of these requirements is that for DICOM interchange media, implementation specific access control is not used or required.
The UDF File Identifier Descriptor for files within the DICOM File Set shall not specify a File Characteristic of "hidden.”