Is there any law problem when our company use a 3rd-party usb-blaster to update the p

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All I want to know is whether the Altera will start a lawsuit to our company if we use 3rd-party blaster to update our product.

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Altera could care less about what you do behind the 'closed doors' of your company. Its up to you how you program your devices.

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Is 3rd-party usb-blaster illegle or not?

Is it forbidden or not?

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A third-party USB-Blaster is not illegal. However, selling a device that uses altera's usb vendor id and device id is most likely illegal.

Terasic is allowed to sell USB-Blaster devices that have Altera's IDs as those two companies have a close relationship.

If you were to buy a cheap USB-Blaster clone from eBay and it comes with the Altera IDs programmed, then it is illegal.

If however, you buy a USB microcontroller or FDTI FT245 and program the IDs, then there is nothing Altera can do about it since they have no way of telling you are doing that.

Cheers,

Dave