cleanroom

Short definition from Wiktionary

Noun

1. 1
   A room or environment that is controlled in such a way as to minimize airborne particulate matter, typically for the purpose of fabricating sensitive electronic or other devices.
2. 2
   The method of copying a design by reverse engineering and then recreating it without infringing any copyrights.
3. 3
   Being or relating to a software development process intended to produce software with a certifiable level of reliability.

Verb

1. 1
   To copy (a design) by reverse engineering and then recreating it without infringing any copyrights.