REVERSE ENGINEERED CODE
What do you think what is reverse engineered code?
Our electronic definitions web site has answer for that as well:
Programming code derived from the de-compilation or disassembly of an executable program. It is often used by hackers and virus writers to determine weaknesses in software security. It is also used by some companies to learn a rivals programming secrets.
There are legitimate uses, such as the recovery of ones own source code that has been accidentally lost. Although the reverse engineered code will often be difficult to understand and will usually require a lot of work to turn it into usable source code. This additional work often negates any of the benefits of reverse engineering.