DMCA sounds like a strange Enochian entity that can be evoked through the use of weird tablets and strange, almost Cthuloid Calls into the beyond world of the dark night.
It's not.
DMCA is short for the Digital Millennium Copyright Act. It was signed into U.S. law just before Samhain (hmmm), 1998, and basically strengthened copyright law enforcement and punishment. If you break copyright laws, it could be quite costly.
This has upset lots of people for a variety of reasons. Copyright is actually one of the few laws set up in the U.S. Constitution. Copyright is "the power to secure for limited times to authors the exclusive right to their writings." (Wikipedia) In other words, if