Paradoxical Protection Effect

The Paradoxical Protection Effect is a theory posed by several leading scientists that states:

Certain objects or people located outside their original time periods that have a significant affect on the outcome of later meta-time events may gain a level of protected from the paradox effect. Thusly any action that would lead to the damage or destruction of said objects or persons that would interrupt this event would break paradox and thusly, are not allowed.

This theory can be best seen in the case of the Silver Canisters that appear to have a remarkable ability to resist damage in any form; it is also interesting that the interior of these Canisters is competly impenitrable. This may be due to a similar affect caused by the contence of the contaniers changing in the future of meta time, this would however lead to the concept of meta time travel.