Adobe Photoshop CS6 User Manual page 167

2. Click the Lock All option in the Layers panel.
Note: Layers in a locked group display a dimmed lock icon
Partially lock a layer
1. Select a layer.
2. Click one or more lock options in the Layers panel.
Lock Transparent Pixels
option in earlier versions of Photoshop.
Lock Image Pixels Prevents modification of the layer's pixels using the painting tools.
Lock Position Prevents the layer's pixels from being moved.
Note: For type and shape layers, Lock Transparency and Lock Image are selected by default and cannot be deselected.
Apply lock options to selected layers or a group
1. Select multiple layers or a group.
2. Choose Lock Layers or Lock All Layers In Group from the Layers menu or the Layers panel menu.
3. Select lock options, and click OK.
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Confines editing to the opaque portions of the layer. This option is equivalent to the Preserve Transparency
.