He need PGP NetShare (Symantec Encryption File Share) licensed on the local machine at home. Configured to allow for "Protect individual files. Allows protection of files not contained in protected folders".
This will allow for copying the file from the server onto a HD to bring home and continue to edit the file, and then copy back onto the server when returning to e.g. office.
However, strongly recommended to only use a HD that is fully encrypted with PGP (Symantec Encryption) as there exist a number of different situation where a file encrypted with NetShare loses its encryption when being outside of the protected folder.
So, Yes this is possible. However, strongly recommend to only use fully encrypted HD for carrying files.
/M