You can read yourself:
In general terms, section 512(a) limits the liability of service providers in circumstances where the provider merely acts as a data conduit, transmitting digital information from one point on a network to another at someone elses request. This limitation covers acts of transmission, routing, or providing connections for the information, as well as the intermediate and transient copies that are made automatically in the operation of a network.
In order to qualify for this limitation, the service providers activities must meet the following conditions:
If you are selecting and changing content then you are losing this protection and need special permission from Google (and other web sites) to operate...
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