DropSend and other similar services have been doing this forever. The only difference here is the marketing--this company is touting the ability to revoke read

DropSend and other similar services have been doing this forever. The only difference here is the marketing--this company is touting the ability to revoke read permissions on the attachments (which all its competitors allow as well) more than it touts the ability to send large files (which is what its competitors hype). It is hard understand why a SAAS email attachment provider hypes security and privacy as its primary benefits; surely it is more secure to keep your attachments in-house and scrubbed out of outbound (through the firewall) emails. Even better, share them out on a network share that has full ACLs and automatic single-sign-on authentication.