More information on USB VID/PIDs.

firmwares/README.txt

@@ -13,5 +13,21 @@ avrdude -p at90usb82 -F -P usb -c avrispmkii -U flash:w:UNO-dfu_and_usbserial_co
 To burn (Mega 2560):
 avrdude -p at90usb82 -F -P usb -c avrispmkii -U flash:w:MEGA-dfu_and_usbserial_combined.hex -U lfuse:w:0xFF:m -U hfuse:w:0xD9:m -U efuse:w:0xF4:m -U lock:w:0x0F:m
 
-Please note that the Arduino VID and PIDs are only for use with official
-Arduino hardware and should not be used on other products.
+
+Note on USB Vendor IDs (VID) and Product IDs (PID): The arduino-usbdfu
+project uses Atmel's VID and MCU-specific PIDs to maintain compatibility
+with their FLIP software.  The source code to the arduino-usbserial
+project includes Atmel's VID and a PID donated by them to LUFA.  This
+PID is used in LUFA's USBtoSerial project, which forms the basis for
+arduino-usbserial.  According to the LUFA documentation, this VID/PID
+combination is:
+
+ "For use in testing of LUFA powered devices during development only,
+ by non-commercial entities. All devices must accept collisions on this
+ VID/PID range (from other in-development LUFA devices) to be resolved
+ by using a unique release number in the Device Descriptor. No devices
+ using this VID/PID combination may be released to the general public."
+
+The production version of the arduino-usbserial firmware uses the
+Arduino VID.  This is only for use with official Arduino hardware and
+should not be used on other products.

firmwares/arduino-usbserial/Descriptors.c

@@ -67,7 +67,7 @@ USB_Descriptor_Device_t PROGMEM DeviceDescriptor =
 		
 	.VendorID               = 0x03EB, // Atmel
 
-	.ProductID          	= 0x2018, // PID_MegaCDC
+	.ProductID          	= 0x204B, // LUFA USB to Serial Demo Application
 	.ReleaseNumber          = 0x0000,
 		
 	.ManufacturerStrIndex   = 0x01,