Vertex relative distance locking As in the title i want to lock the distance between a group of vertices so when i edit the object they won't move in the group but be able to move as a group.  

Those are the vertices.
 

Can it be done?
I don't believe that it's possible to actually lock vertices. I can think of a workaround though.

Select the vertices you want locked in vertex select mode, and press H. This will hides them, so you won't be able to move them around.

When you're done, and you want to bring them back (unlock them) just press AltH