embedded - Is there a way to prevent code being read from an MSP430 without blowing the fuse?

I was recently involved at a project in a small company where we had fears of someone taking the code from the master chip, an MSP430F2419, and using it for a competing product. We ended up blowing the JTAG fuses for the first few beta releases, but because of the blown fuses we could not reprogram them. Is there a middle ground between blowing the JTAG fuse that will prevent someone from reusing the code on the chip, but let us reprogram the chip?