You might, even though the chances are very doubtful (I've read comparisons that say you have a better chance of winning the lottery or being hit by lightning).

Since so little of the content people share is already licensed, you have to use your best judgement whether your country's laws allow you to share those files you find. You could ask a lawyer for the legal opinion, but they too have trouble keeping up with the changes, especially as those laws are still being tested in courts.

Really though--for a legal opinion ask a lawyer.