Hi Gianpiero,
A mainframe dataset in EBCDIC encoding can be masked by Delphix. it won't be accurate IMO to call it a "text" file as it has a separate structure. Users can mask most VSAM, QSAM types of datasets, they need to be moved to an OSS/ SFTP directory for Delphix to connect. The user will also need to provide the associated COBOL copybook in order to parse the VSAM,
Thanks
Hims