Hide block implementation in the Simulink+DSP Builder environment

Dear Altera users,

In Simulink with DSP Builder, is it possible to hide the implementation of a subsystem with blocks from Matlab and Altera as well as interconnections while also be able to share the subsystem to a partner for integration and synthesis?

It is allowed by our company to share the implementation to partners.

Thank you in advance.

Bests,

Hanwen