In a related instance, anyone who is active online with Magic the Gathering and was around, say, a year before Time Spiral came out knows that a certain website gained access to beta versions of some cards from Time Spiral. Due to their nature,
WotC sued the person who released the information on the 'Net. They did so not to punish him, necessarily, but to follow the data trail to find the original leak.
A few years later, here we are, and you know what? Premature leaking of card information on new Magic sets is way down.
This is anecdotal evidence, for me, that in this industry, we can combat this.