Not even drivers, AFAIK; it's firmware blobs that have to be loaded to the device in order for it to run, but nothing on the actual "host" computer side. So like, if you have a wifi card with blobs, you have to hand it a firmware blob to "boot" the card, but once it's up you can talk to it using a fully GPLv2 driver in Linux (which talks to the proprietary wireless firmware over PCIe or whatever).