It's mostly laws for things such as piracy/warez and so forth, but theres also the aspect that this is a family site with people of all ages visitng, and common sence has to be bought into perspective too.
Things like that are kind of 'border line' so to speak.
It'd come down to a moderators perspective if they see something like that.
As you mentioned Music copying for personal use, I think that most countries do allow legal backups of things you have purchased.
Most things are never really 100% clear because of the internet being a world wide system and different countries will have different laws.
Your best bet is to post anything you wish (within reasonable common sence) and if you think that something may in-fact go against the guide lines then ask a moderator if it's acceptable.