A into Authorized Digital Outputs and Authorized Digital Removable Media Recording Methods. The two Authorized Outputs mentioned were Digital Transmission Content Protection (DTCP) and High-bandwidth Digital Content Protection (HDCP); the two Recording Methods mentioned were Content Protection for Recordable Media (CPRM) and D-VHS. DTCP is a copy-control scheme for digital video devised by five companies (called the "5C consortium"). HDCP is a similar copy-control scheme devices by only four companies (the "4C consortium"). Both of these schemes restrict what a consumer can do with digital video; both require a license if a device manufacturer is going to be able to implement them; both constrain the functionality of products in which they are incorporated. Both cost money to implement—the licenses are not free. DTCP encrypts video transmitted over a digital bus called IEEE 1394 (or "FireWire"). HDCP encrypts video transmitted over a different—and video-specific—bus called Digital Visual Interface ("DVI"). The encryption, in both cases, is meant to "protect" the content against the consumer, and to restrict playback of the content to "authorized", licensed devices. Content Protection for Recordable Media (CPRM) is an encryption scheme for recordable media which is also meant to prevent media from being played back in devices other than those licensed by the 4C consortium. D-VHS is a new digital videotape spec which—you guessed it—also prevents media from being played back, except in licensed devices. So here the suggestion was that four particular copy-control technologies, all closed standards and all of which have "compliance and robustness rules" of their own, were to be permitted as outputs from digital television receivers; all other video standards, and all other recording media, were to be banned by default. Since the BPDG was formed by companies from the 5C and 4C consortia, it is difficult to imagine that it would recommend that their technologies not be permitted. Subsequently, the specific technology list was removed from Table A; the current discussion draft from BPDG does not contain any specific technologies at all, though it still bans "unauthorized" technologies by default. But now Table A has been left blank, and a discussion has begun about a proper procedure for choosing technologies to be added. (This shift took place as a result of a discussion at the last BPDG in-person meeting in Los Angeles.) All current proposals for filling in Table A seem to involve agreement by some number of major movie studios—that is, members