A method for deleting files on a UNIX file system, so that they may subsequently be undeleted, without any possibility of loss or damage. A file deleted with the "rm" command, or targeted by the "cp" or "mv" commands, is deleted simply by marking its directory record "deleted", while its inode and data...http://www.google.de/patents/US6615224?utm_source=gb-gplus-sharePatent US6615224 - High-performance UNIX file undelete
