I found this article, New USB Enforced Encryption Device for Mac OS, and possible solutions:
It has always been a challenge for IT administrators to find solutions
and tools compatible with Mac OS X, but now securing the network and
data Mac users access is also becoming a priority.
CoSoSys' Endpoint Protector 4 with Enforced Encryption on
removable storage devices for Mac OS X solves these problems.
It offers an easy, yet secure way for Mac users to encrypt data copied
onto USB storage devices. With intuitive 'drag & drop' and copy/paste
features, all information copied on the device is instantly protected
by password-based military strength AES 256-bit encryption. The
Enforced Encryption functionality also incorporates an additional
security feature that deletes information if an attempt is made to
tamper with the data, or when the device gets lost or stolen.
Therefore, stopping users from taking classified information from Macs minis, iMacs, Mac Pros, MacBooks onto portable devices has become an imperative for the companies' data security. Locking down and monitoring proactively the use of USB, CD/DVD, card readers, etc. is possible with Device Control by Endpoint Protector for Mac OS X and can be managed centrally from the intuitive web-based interface.