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In light of the fact that other than the DMCA there are no laws that directly prohibit or restrict reversing, and that the DMCA only applies to DRM products or to software that contains DRM technologies, software vendors add anti-reverse-engineering clauses to shrink-wrap software license agreements. That s that very lengthy document you are always told to accept when installing practically any software product in the world. It should be noted that in most cases just using a program provides the legal equivalent of signing its license agreement (assuming that the user is given an opportunity to view it). The main legal question around reverse-engineering clauses in license agreements is whether they are enforceable. In the U.S., there doesn t seem to be a single, authoritative answer to this question it all depends on the specific circumstances in which reverse engineering is undertaken. In the European Union this issue has been clearly defined by the Directive on the Legal Protection of Computer Programs [EC1]. This directive defines that decompilation of software programs is permissible in cases of interoperability. The directive overrides any shrink-wrap license agreements, at least in this matter.

This book contains many code samples and demonstrates many reversing tools. In an effort to avoid any legal minefields, particularly those imposed by the DMCA, this book deals primarily with sample programs that were specifically created for this purpose. There are several areas where third-party code is reversed, but this is never code that is in any way responsible for protecting copyrighted materials. Likewise, I have intentionally avoided any tool whose primary purpose is reversing or defeating any kind of security mechanisms. All of the tools used in this book are either generic reverse-engineering tools or simply software development tools (such as debuggers) that are doubled as reversing tools.

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In this chapter, we introduced the basic ground rules for reversing. We discussed some of the most popular applications of reverse engineering and the typical reversing process. We introduced the types of tools that are commonly used by reversers and evaluated the legal aspects of the process. Armed with this basic understanding of what it is all about, we head on to the next chapters, which provide an overview of the technical basics we must be familiar with before we can actually start reversing.

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This chapter provides an introduction to low-level software, which is a critical aspect of the field of reverse engineering. Low-level software is a general name for the infrastructural aspects of the software world. Because the low-level aspects of software are often the only ones visible to us as reverse engineers, we must develop a firm understanding of these layers that together make up the realm of low-level software. This chapter opens with a very brief overview of the conventional, high-level perspective of software that every software developer has been exposed to. We then proceed to an introduction of low-level software and demonstrate how fundamental high-level software concepts map onto the low-level realm. This is followed by an introduction to assembly language, which is a key element in the reversing process and an important part of this book. Finally, we introduce several auxiliary low-level software topics that can assist in low-level software comprehension: compilers and software execution environments. If you are an experienced software developer, parts of this chapter might seem trivial, particularly the high-level perspectives in the first part of this chapter. If that is the case, it is recommended that you start reading from the section titled Low-Level Perspectives later in this chapter, which provides a low-level perspective on familiar software development concepts.

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