Just to add my 2c. A while ago I was working on a project which could use data in WHOIS records. Ultimately this failed because the data is very unreliable and mostly unavailable, but I did come accross some laws.
Seems the U.S. is pretty much the only country that has a law on this, and it just says that it is illegal to have inaccurate information in a WHOIS record if and only if you're using that inaccurate information to scam people. So basically you can use inaccurate information all you want but if you're conficted of scamming people online, the use of inaccurate WHOIS information can be used to add some additional jailtime.