Files with ocs suffix are in most cases secured documents send / prepared using the eDoc DigiSign platform by Fujitsu.
OCS file extension - eDoc DigiSign digitally signed document
What is ocs file? How to open ocs files?
File type specification:
File extension ocs seems to be primarily associated with eDoc DigiSign from Fujitsu and used for one of its default file types. Most likely some special designed document format.
MIME: application/x-edocdigisign