I asked a lawyer who is into copyright issues. He said that linking is considered copyright infringement too. The same laws are applied on both P2P sharing and warez linking. Streaming is copyright infringement too. The lawyer represents an anti-piracy group (The one that closed the TPB clone , BTArena )and the group recently sued Romania's Youtube equivalent (Trilulilu). Will see what will happen.

In the end the most important thing is to remove the content if you receive a DMCA complaint.