DVD-ROM drive under Linux is illegal in the U.S.

Few Linux users are aware that running a licensed DVD drive on computer may be a violation of Digital Millennium Copyright Act (DMCA) law as well as unlock and removalof DRM-protection of books and much more.
Incidentally, this is why Ubuntu and other Linux distributive refused built DVD-player so that each user has to download the libdvdcss library but not from the official repository.
Journalist and Linux fan Chris Hoffman outlined the problem in a simple way. The problem occurs in the libdvdcss library which breaks the protection of DVD-ROM drive with the help of brute force 40-bit encryption and the used does not know about that.

DMCA (Digital Millennium Copyright Act, copyright law in the digital age) put outside the legal framework not only a direct copyright infringement by copying but also the production and dissemination of technology to circumvent technological protection of copyright. Similar laws apply in certain other countries, such as Germany.
Content of most licensed DVD is encrypted using the Content Scramble System (CSS)which is a variant of DRM. The rights holders formed associations DVD Copy Control Association (DVD CCA) and get royalties from each DVD-player sold worldwide that has the support of CSS. Without such support the encrypted disc content simply could not be played. Under the agreement the manufacturer of DVD-player is obliged not only to pay royalties but also support system of regional coding so that the DVD-ROM bring purchased in one region of the world will not play on your player being sold in another region.


Brute force fof CSS

Unfortunately for media firms when in in 1996 they made the specification for CSS, America has imposed restrictions on the export of strong cryptography. Thus, CSS encryption key so had to limit up to 40 bits and the effective key size of only 16 bits. Due to this fact system CSS was quickly hacked. In 1999 a well-known program DeCSS appeared in the market which was published by 15-year-old Norwegian student John Johansen andbased on reverse engineering of code player Xing. DeCSS program is still widely used in the Internet since it allows easy enough to remove the CSS protection from any DVD disc using brute force. Young hacker years dragged through the courts but eventually claimed as not guilty and he now works as a programmer in the U.S.

After the appearance of DeCSS Linux users got the opportunity to view the licensing DVD on a PCs. Pentium II performs brute force 16-bit encryption in about a minute but modern PCs for a few seconds, completely going through all the options and taking the correct encryption key.

Now we come to the major point which is the libdvdcss library overcoming the burglary protection of CSS. When a user inserts a DVD and video player starts, the library in the background begins to brute force attack. It ends so quickly that this delay can be Dudgeon invisible to the user, and then begins playing from the DVD-ROM. So, the only legal way to view the DVD under Linux license for Americans is to purchase certified software for viewing DVD with official support for CSS e.g. Fluendo DVD Player.