ah wait. you say you got it from a conference with stuff on it. that i think probably changes things.
I haven't used Windows in some time. I suspect though Disk Management has a setting that can allow it to be formatted. My suspicion is that there is a software setting to make it read only. And if that is the case, then there is very likely a case to do otherwise.
I remember my wife once brought back a USB like that which caused issues in XP, but whas readable in Linux as any other USB stick. Of course we never tried to format it, but I suspect I could have if I wanted to.