Intent matters.<p>Driving a taxi is legal, and telling people where to find a bank is legal, but if you start advertising a &quot;bank robber target selection and getaway service&quot; then you&#x27;ll end up being thrown in jail for bank robbery, because you were knowingly assisting in the crime even though your actions taken in isolation were entirely legal.<p>Similarly, providing someone with a checksum of a file is not copyright infringement in itself, but it becomes illegal when you do it <i>with the intent of assisting copyright infringement</i>.