Sub licensing blocks of PID's would be a good thing for everybody.
FTDI apparently offers that concept to users of their chips: unique DIDs under FTDI's VID.
Sensible.
They do indeed, we have in the past used FTDI chips in products where we've used microcontrollers that do not have USB built in.
Microchip also provide PIDs (for free) for products if you are using a PIC with USB, you just fax over a form and in return you get some PIDs allocated to you.
Just a shame that the people at the top (the USB-IF) want to charge $2k for a huge block that for most people is way over the top. (And it's also delightfully described as an "admin fee")
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