The trading of financial products while in possession of information, or having received information, that is not generally available to the public. (moneysmart.gov.au)
In some jurisdictions, knowing possession of information obtained in specific illegal ways is illegal. (law.stackexchange.com)
There are very few cases where mere intentional possession of information is illegal with no other elements at all, at least in most major countries. (law.stackexchange.com)