I seem to remember when I was at a small ISP helping plan fiber optic networks, that fiberstore.com had a promotion going on where if you bought enough of their gear and made good reviews, they'd send you a free SFP reprogrammer which would somehow allow you to change vendor-locks on existing SFPs to let you take say a Cisco branded SFP and use it in an HP Aruba switch.

It seems silly to me how there's all these standards for the transceivers, but vendors still lock people in with hardware codes, etc.