Reviewing all security aspects to TinyCLR/SITCore, we have found couple needed improvements. One is internal but the second will effect you.
TinyCLR config tool now generates an encrypted application deployment. You can now safely send the firmware to your customer knowing that this file can only be used on your own devices. Assuming you have enabled the application protection on your device of course
Due to above, we have not shipped the boards yet. We are going through QC and if all is well we hope to ship on Monday.