If you meant an on data recovery or software cracking (e.g., reverse engineering), I can help outline a research paper on those topics, but not on obtaining or distributing cracked software. Let me know.

"To recover files of this size, please enter your registration key."

If you need to recover data but cannot afford a premium license, there are several highly effective, 100% free tools that don't require a registration key. 1. Recuva (by CCleaner)