When Congress passed the Digital Millennium Copyright Act in 1998, section 1201 outlawed circumvention of technological protection measures controlling access to copyright works. The base concept is relatively simple. When technological systems are deployed by copyright holders (or on their behalf) to protect access to their copyrighted works, in most cases these systems cannot be circumvented without violating the DMCA. Section 1201 also prohibits trafficking in technology or services that facilitate the circumvention of such systems. (torrentfreak.com)