Locking Objects
By locking you can protect objects against unintentional 
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                                                             | To lock an object, click the lock icon at the bottom of an object or choose Menu Object > Edit objects > Lock Objects. | 
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                                                             | Clicking again on the lock icon or menu Object > Edit objects > Unlock objects unlocks the object again. | 
By default, locking prevents objects only from moving. In the program preferences for locking objects (menu Object > Lock objects > Lock definitions…) you can define further object properties (deletion, change of length, fades or volume...) to be locked for locked objects.
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                                                                 | To lock all objects on a track, click the lock icon in the track head or track editor. Right-click on a lock symbol to assign the track to one of 16 lock groups. Membership of such a group can be identified by the different colored dots on the lock symbol  | 
You can temporarily disable the lock function by holding down the Alt key while clicking objects.
 
                                                            
                                                         
                                                            
                                                         
                                                             . Clicking on the lock symbol in a lock group locks or unlocks all members of the lock group.
. Clicking on the lock symbol in a lock group locks or unlocks all members of the lock group.