Each encryption session is independent, and it has an independent revocation system. This portion of the standard is licensed separately. It also adds the ability to verify the proximity of the receiver and transmitter, a technique intended to ensure users are not bypassing the content protection system to send data out to distant, unauthorized users. DisplayPort1.1 added optional implementation of industry-standard 56-bit HDCP (High-bandwidth Digital Content Protection) revision 1.3, which requires separate licensing from the Digital Content Protection LLC. DisplayPort1.3 added support for HDCP2.2, which is also used by HDMI2.0. Cost VESA, the creators of the DisplayPort standard, state that the standard is royalty-free to implement. However, in March 2015, MPEG LA issued a press release stating that a royalty rate of $0.20 per unit applies to DisplayPort products manufactured or sold in countries that are covered by one or more of the patents in the MPEG LA license pool, which includes patents from Hitachi Maxell, Philips, Lattice Semiconductor, Rambus, and Sony. In response, VESA updated their DisplayPort FAQ page with the following statement: As of August 2019, VESA's official FAQ no longer contains a statement mentioning the MPEG LA royalty fees. While VESA does not charge any per-device royalty fees, VESA requires membership for access to said standards. The minimum cost is presently $5,000 (or $10,000 depending on Annual Corporate Sales Revenue) annually. Advantages over DVI, VGA and FPD-Link In December 2010, several computer vendors and display makers including Intel, AMD, Dell, Lenovo, Samsung and LG announced they would begin phasing out FPD-Link, VGA, and DVI-I over the next few years, replacing them with DisplayPort and HDMI. DisplayPort has several advantages over VGA, DVI, and FPD-Link. Standard available to all VESA members with an extensible standard to help broad adoption Fewer lanes with embedded self-clock, reduced EMI with data scrambling and spread spectrum mode Based on a micro-packet protocol Allows easy expansion of the standard with multiple data types Flexible allocation of available bandwidth between audio and video Multiple video streams over single physical connection (version 1.2) Long-distance transmission over alternative physical media such as optical fiber (version 1.1a) High-resolution displays and multiple displays with a single connection, via a hub or daisy-chaining HBR2 mode with 17.28Gbit/s of effective video bandwidth allows four simultaneous 1080p60 displays (CEA-861 timings), two 2560 × 1600 × 30 bit @ 120Hz (CVT-R timings), or 4K UHD @ 60Hz HBR3 mode with 25.92Gbit/s of