Neither of those examples presents a resounding success story. Restrictions on cryptography proved infeasible, and were abandoned; copyright prohibits duplication of others' work only when it's for profit, and is only sporadically effective even at that.
There's also there monopolies and mergers commission. The government doesn't foster the development of big and powerful agents that might someday compete with it.
Ben Goertzel and Joel Pitt: Nine Ways to Bias Open-Source AGI Toward Friendliness. Journal of Evolution and Technology - Vol. 22 Issue 1 – February 2012 - pgs 116-141.
I'd say it's worth a read - they have pretty convincing criticism against the possibility of regulating AGI (section 3). I don't think that their approach will work if there's a hard takeoff or a serious hardware overhang, though it could maybe work if there isn't. It might also work if there was the possibility for a hard takeoff, but not instantly after developing the first AGI systems.