What's the rule/etiquette regarding looting the kills of others?

[Loadsamoney]

I'm noticing a lot of Fine Steel Swords being left to rot on the dead guards in High Keep and I'm highly tempted to scoop them up. What's the general rule/etiqeutte on doing this, looting others kills if they leave the corpses untouched for extended periods of time? I don't want to come off as a jerk to people, but I'm also not one to say no to free money if people don't want it, and that's the impression I get when people don't loot their kills.