Comput. designating or of a file whose contents can be read or viewed, but not altered
Unalterable, capable of being read but not written. Especially common in computer terms such as read-only memory and read-only access to files or directories (in in file system permissions or programs).
read only - Computer Definition
(1) Refers to storage media that permanently hold their content such as ROM chips, CD-ROMs and DVD-ROMs. See ROM, CD-ROM and DVD-ROM.
(2) A file that can be read, but not updated or erased. See file attribute.