Prevent the implementation of the data that refer to it, DEP is said to be one of the mechanisms of security in Microsoft Windows operating system. The technology of code from portions of memory as non-executable. prevent. With the use of this feature can be of some abuse that, in effect, overflow of the buffer created can be prevented. This feature to might be implemented. In the first type of hardware processor, a corresponding this feature is supported and can be Regions non-executable memory, mark. The second type implement the software, this technology is in the software try to be that these restrictions apply. It should be noted that the method of hardware, software is more efficient, and the limitations are less.