With the free version of Atakama Basic you are able to share files within a location (e.g., network drive, Dropbox, Google Drive) for up to four Atakama-enabled computers. If more than four Atakama-enabled computers attempt to access the shared file location, those additional computers will be unable to access Atakama-encrypted files.
To enable sharing with more than four computers you will need a subscription to Atakama Premium.