Reply from Da Product:

Our protectors attach using "Perm-A-Stick" adhesive which is commonly used in the acrylics industry. The protector is "semi-permanent", but can be safely removed by following the proper removal instructions (see below).

Removal Instructions
Once applied, the application is "semi-permanent" meaning that it can be removed with the proper technique. DO NOT pry off the protector as this will work against the strength of the adhesive. You can easily break the adhesive seal by using dental floss or sliding your fingernail under the protector. Any residual adhesive can be cleaned with a few drops of ordinary alcohol, Goo-Gone, or even cooking oil on a Q-Tip. Be sure to avoid getting any cleaning fluids into the internal workings of the camera.