Nik Software Color Efex Pro 3.0 offers a wide range of features and benefits, including:

As for the software itself, Nik Software Color Efex Pro 3.0 offers a wide range of features and tools, including:

If you already own a license but lost the key, check old emails, the original CD case, or your Nik Software account (if it still exists). Otherwise, your safest and most ethical option is to buy the current Nik Collection from DxO.