What is the difference between the HDMI Forum and HDMI LA?

The HDMI Forum is the standards body that has developed the HDMI specification since version 2.0. HDMI LA (HDMI Licensing Administrator, LLC) is a distinct legal entity that licenses the HDMI trademark, manages the Adopter Agreement, collects royalties and operates the product and cable certification programme. One body writes the specification, the other commercialises its use.

Is an HDMI Adopter Agreement required to ship a product with an HDMI port?

Yes. Any company that fits an HDMI connector, applies the HDMI trademark or logo, or claims HDMI compatibility must sign the HDMI Adopter Agreement with HDMI LA. The agreement grants access to the HDMI specification and the right to use the marks, subject to annual fees and per-unit royalties.

Does an HDMI 2.1 chipset mean the product is HDMI 2.1 certified?

No. A chipset capable of FRL and Dynamic HDR does not imply that the finished product is HDMI 2.1 certified. Certification requires the complete product (with its firmware, power supply, PCB layout and connectors) to be tested in an Authorized Test Center against the applicable Compliance Test Specifications, and a certificate to be issued by HDMI LA.

What do the HDMI cable categories cover?

HDMI defines four categories: Standard (up to 720p / 1080i), High Speed (up to 1080p and limited 4K), Premium High Speed (up to 18 Gbps, reliable 4K 60 Hz HDR) and Ultra High Speed (up to 48 Gbps FRL, 8K 60 Hz, 4K 120 Hz). Only the Premium High Speed and Ultra High Speed categories are subject to a mandatory cable certification programme to use the associated logo.

Is HDCP managed by HDMI LA?

No. HDCP (High-bandwidth Digital Content Protection) is administered by Digital Content Protection, LLC (DCP LLC), an entity entirely separate from HDMI LA. HDCP is a content protection layer overlaid on HDMI, and adopting it requires a separate DCP licence agreement with its own fees and its own robustness rules.

What is the purpose of the Ultra High Speed HDMI Cable Certification programme?

This programme makes cable certification mandatory for any Ultra High Speed HDMI claim. Each certified cable is marked with a holographic label and a traceable QR code. The aim is to counter the proliferation of non-compliant cables sold as 8K or 48 Gbps but unable to meet the high-bitrate signal integrity tests. Without a certificate, use of the Ultra High Speed logo is prohibited.

What do eARC and CEC cover in the HDMI specification?

eARC (Enhanced Audio Return Channel) is the high-bandwidth audio return channel introduced in HDMI 2.1, supporting uncompressed audio and object-based bitstreams (Dolby Atmos, DTS:X). CEC (Consumer Electronics Control) is a control bus that lets multiple HDMI devices share commands (standby, source select). Both features are defined by the HDMI specification but their implementation and certification are optional.

Does HDMI certification cover CE or FCC requirements?

No. HDMI certification is a private trademark and conformance-to-specification programme. It does not cover regulatory requirements such as CE (EMC, LVD) or FCC Part 15. A product with an HDMI port must combine HDMI LA certification with the regulatory conformance applicable to its category (EMC via EN 55032 / EN 55035, electrical safety via EN IEC 62368-1, FCC Part 15 subpart B in residential environments).

HDMI Forum and HDMI LA: device and cable certification

Author Hugues Orgitello Last updated 27 May 2026 ~14 min read

Guide · HDMI Forum / HDMI LA

HDMI certification occupies, in the audiovisual interface landscape, a position analogous to that of the Bluetooth SIG or Wi-Fi Alliance programmes. It is not a regulatory framework imposed by a public authority, but a contractual regime upheld by two private entities with distinct roles: the HDMI Forum, the standards body that has developed the HDMI specification since version 2.0, and HDMI LA (HDMI Licensing Administrator, LLC), the trademark administrator that licenses the HDMI name, manages the Adopter Agreement, collects royalties and operates the product and cable certification programme. This page sets out the Forum versus LA split, the Adopter Agreement, HDMI versions 1.4 through 2.1b and their technical contributions (FRL, Dynamic HDR, eARC), cable categories and their certification, the relationship with HDCP (Digital Content Protection, LLC), the Compliance Test Specifications operated by Authorized Test Centers, and the pitfalls associated with incomplete commercialisation.

HDMI Forum versus HDMI LA

The first distinction to keep in mind is the one between the two entities that structure the HDMI ecosystem. They share the trademark but occupy non-interchangeable roles.

HDMI Forum, the standards body

The HDMI Forum is the not-for-profit organisation that has developed the HDMI specification since the publication of HDMI 2.0 in 2013. Constituted as an open consortium for its members (adopters and contributors), it publishes successive versions of the specification, errata, technical amendments and the reference Compliance Test Specifications. Earlier versions (HDMI 1.0 through 1.4) were developed by the original founders (Hitachi, Panasonic, Philips, Silicon Image, Sony, Thomson, Toshiba) before specification maintenance was transferred to the Forum. The Forum does not licence the trademark nor operate a certification programme.

HDMI LA, licensor and certification operator

HDMI Licensing Administrator, LLC is a separate legal entity, the exclusive licensing agent for the rights tied to the HDMI mark. HDMI LA signs the HDMI Adopter Agreement, manages annual adoption fees, per-unit royalties and promotional licence fees, operates the certification programme, accredits Authorized Test Centers (ATCs) and issues product and cable certificates, and pursues infringement actions when an unlicensed product uses the HDMI name.

In short: the Forum writes, HDMI LA commercialises. A product compliant with the HDMI specification in the Forum's technical sense has no right to use the trademark until it holds an HDMI LA licence and passes certification.

Role comparison

Dimension	HDMI Forum	HDMI LA
Nature	Standards body	Licensor and administrator
Output	HDMI specification, Compliance Test Specifications	Adopter Agreement, licences, certificates
Members	HDMI Forum adopters and contributors	HDMI Adopter Agreement signatories
Revenue	Forum membership fees	Annual fees, per-unit royalties, certification fees
Decisions	Specification versions, errata	Product conformance, trademark usage rights

Forum membership grants participation in specification evolution. The HDMI LA Adopter Agreement is what opens the right to ship HDMI in a commercial product. Neither substitutes for the other.

Distinction from the regulatory regime

Unlike CE marking or FCC certification, neither the Forum nor HDMI LA acts as a public authority. HDMI certification is a private contractual regime: its decisions carry contractual, not regulatory, weight. As a result, an HDMI-certified product must in parallel meet every regulatory requirement applicable to its category. See CE marking pillar and in particular harmonised CE standards for EMC (EN 55032, EN 55035) and electrical safety (EN IEC 62368-1).

The HDMI Adopter Agreement

The HDMI Adopter Agreement is the framework contract signed between a company and HDMI LA. Without an agreement in force, fitting an HDMI connector in a consumer product, using the HDMI name on packaging or applying an HDMI logo constitutes trademark infringement.

The agreement grants access to the HDMI specification and its Compliance Test Specifications, the right to fit an HDMI connector subject to certification, the right to apply the trademark and logos within the HDMI Brand Style Guide, and eligibility to submit products to an Authorized Test Center.

Financial structure

The Adopter Agreement carries three types of financial flow, the exact amounts of which are published by HDMI LA and evolve. This page describes them qualitatively.

Annual adoption fees. A fixed yearly fee to remain an adopter member.
Per-unit royalties. A royalty per manufactured product incorporating HDMI, typically calculated on annual volume and potentially reduced if the manufacturer joins the HDMI Logo programme (compliant logo use in marketing).
Certification fees. Charges levied by ATCs for running the CTS, distinct from the royalties.

The Adopter Agreement may be complemented by separate agreements for HDCP (administered by DCP LLC) or for certain optional extensions.

Adopter versus Forum contributor

Being an HDMI LA adopter and being an HDMI Forum contributor are two independent statuses. A consumer electronics manufacturer may very well be only an HDMI LA adopter without joining the Forum's normative work.

Specification versions

The HDMI specification evolves by major versions. Each version defines a functional perimeter (resolutions, refresh rates, audio formats, control features) and a maximum transmission bitrate. Backwards compatibility is preserved: an HDMI 2.1 device must accept an HDMI 1.4 signal.

HDMI 1.4

Published in 2009. The first version to introduce 4K resolutions (3840x2160 and 4096x2160) at 24 or 30 Hz, limited by the 10.2 Gbps cap across three TMDS pairs, the HDMI Ethernet Channel (HEC), the Audio Return Channel (ARC), 3D stereoscopic and Type C (Mini) and Type D (Micro) connectors.

HDMI 2.0 and HDMI 2.0a/b

HDMI 2.0 (2013) keeps TMDS but raises the bitrate to 18 Gbps: 4K 60 Hz at 4:4:4 8-bit chroma or 4:2:0 10-bit, audio up to 32 channels and 1536 kHz, Wide Color Gamut (BT.2020). HDMI 2.0a (2015) adds static HDR signalling (HDR10). HDMI 2.0b (2016) extends to HLG (Hybrid Log-Gamma) for broadcast distribution.

HDMI 2.1, the FRL step change

HDMI 2.1 (2017, with later updates) introduces Fixed Rate Link (FRL), a new transmission mode that replaces TMDS beyond 18 Gbps. FRL uses four lanes (instead of three TMDS data lanes plus a clock) with 16b/18b encoding, enabling:

Maximum bitrate of 48 Gbps (12 Gbps per lane across 4 lanes), with 4K 120 Hz, 8K 60 Hz and 10K 60 Hz across the various modes, plus optional Display Stream Compression (DSC) for the most demanding configurations.
Dynamic HDR: per-frame variable HDR metadata (Dolby Vision, HDR10+).
eARC: Enhanced Audio Return Channel, supporting uncompressed bitstreams up to 7.1 channels and object-based formats (Dolby Atmos, DTS:X) in lossless bitstream.
Game Mode VRR: Variable Refresh Rate, ALLM (Auto Low Latency Mode), QFT (Quick Frame Transport), QMS (Quick Media Switching).

HDMI 2.1a and 2.1b

HDMI 2.1a (2022) introduces Source-Based Tone Mapping (SBTM), which delegates HDR tone mapping to the source based on the display's capabilities. HDMI 2.1b (2024) refines aspects of the FRL layer and signalling, without a user-facing functional jump.

Bandwidths and resolutions per version

Version	Transmission	Max bitrate	Typical modes	Key contributions
HDMI 1.4	TMDS	10.2 Gbps	1080p 60 Hz, 4K 30 Hz	HEC, ARC, 3D
HDMI 2.0	TMDS	18 Gbps	4K 60 Hz 4:4:4 8-bit	BT.2020, HDR10 (2.0a), HLG (2.0b)
HDMI 2.1	TMDS or FRL	48 Gbps FRL	4K 120 Hz, 8K 60 Hz, 10K 60 Hz	FRL, Dynamic HDR, eARC, VRR
HDMI 2.1a	FRL	48 Gbps	As 2.1	SBTM
HDMI 2.1b	FRL	48 Gbps	As 2.1	FRL and signalling clarifications

The listed bitrates are the maximum capability of the physical link. The modes actually supported depend on product implementation (chipset capability, cable used, sink capability) and on the features declared by the manufacturer. Refer to the HDMI specification published by the HDMI Forum for complete tables and conditions of application.

Cable categories and cable certification

The HDMI cable is a full system component. Its electrical capability determines which modes can be transmitted. HDMI LA structures the cable market around four categories and two cable certification programmes.

The four categories

Standard HDMI Cable. The historical category, up to 720p or 1080i. Largely obsolete.
High Speed HDMI Cable. Up to 10.2 Gbps, that is 1080p 60 Hz and limited 4K. Standard category for HDMI 1.4.
Premium High Speed HDMI Cable. Up to 18 Gbps, hardened for 4K 60 Hz HDR. Associated with HDMI 2.0.
Ultra High Speed HDMI Cable. Up to 48 Gbps FRL, for 4K 120 Hz, 8K 60 Hz and beyond. Associated with HDMI 2.1 and FRL mode.

Cable certification programmes

Two programmes require cable certification to use the corresponding label. The HDMI Premium Certified Cable Program attests that a High Speed cable has passed EMI and signal integrity tests at 18 Gbps, with a holographic label and verification code. The Ultra High Speed HDMI Cable Certification Program attests that a cable has passed tests at 48 Gbps FRL and supports HDMI 2.1 features (more demanding EMI, signal integrity at high bitrate, eARC), with a holographic label and traceable QR code.

Without a valid certificate, a cable manufacturer cannot claim Ultra High Speed HDMI conformance nor apply the corresponding logo. Claiming 8K or 48 Gbps on a non-certified cable exposes the seller to a trademark infringement action.

Cable summary table

Category	Target bitrate	Useful modes	Certified logo	Dedicated programme
Standard HDMI	Low	720p, 1080i	Standard HDMI logo	No dedicated programme
High Speed HDMI	10.2 Gbps	1080p 60 Hz, 4K 30 Hz	High Speed logo	None mandatory
Premium High Speed HDMI	18 Gbps	4K 60 Hz HDR	Premium HDMI Certified logo	Premium Cable Program
Ultra High Speed HDMI	48 Gbps FRL	4K 120 Hz, 8K 60 Hz	Ultra High Speed HDMI logo	Ultra High Speed Program

Cable certification is independent of product certification (HDMI source or sink). An 8K television certified HDMI 2.1 shipped without an Ultra High Speed certified cable in the box can still operate with a Premium High Speed cable if the user stays within 18 Gbps modes; reaching 48 Gbps, however, requires a cable certified in that category.

HDCP, a distinct scope

HDCP (High-bandwidth Digital Content Protection) is the protection mechanism for video and audio content transmitted over HDMI. It is frequently confused with HDMI itself in marketing discourse, while it falls under separate administration.

Digital Content Protection, LLC

HDCP is administered by Digital Content Protection, LLC (DCP LLC), an Intel subsidiary, a legal entity entirely separate from HDMI LA and the HDMI Forum. DCP LLC publishes the HDCP specification (HDCP 1.x on TMDS links, HDCP 2.x on IP links and FRL), signs HDCP Adopter Agreements, issues the cryptographic key pairs indispensable for HDCP authentication, and defines the robustness rules that impose physical and software protection of the keys inside the product.

Why HDCP overlays HDMI

HDCP is an optional protection layer that grafts onto HDMI (and onto other interfaces: DisplayPort, USB Type-C with DP mode). From the HDMI perspective, the HDCP channel uses the DDC (Display Data Channel) for authentication and key exchange, then encrypts video and audio packets. An HDMI device may ship without HDCP: it will be limited to unprotected content. Most current consumer devices include HDCP because premium sources (Netflix 4K, Blu-ray, Apple TV) require HDCP 2.2 or later to deliver content at full resolution.

HDMI versus HDCP role split

Question	HDMI LA	DCP LLC
Defines the specification?	No, the HDMI Forum does	Yes, HDCP
Licenses the HDMI mark?	Yes	No
Licenses HDCP?	No	Yes
Issues cryptographic keys?	No	Yes
Defines robustness rules?	No	Yes
Concerns the cable alone?	Yes, Premium and Ultra High Speed programmes	No, HDCP is a protocol layer

A product with an HDMI port claiming support for premium 4K content must therefore combine three distinct contractual agreements: the HDMI LA agreement, the HDCP agreement with DCP LLC, and optionally a Forum agreement if the company wishes to take part in normative work. This stratification is invisible to the end user but structures the manufacturer's certification budget.

CEC, ARC and eARC

HDMI defines several auxiliary channels that the specification documents but whose implementation and certification remain optional.

CEC (Consumer Electronics Control) is an optional bidirectional serial channel on a dedicated wire of the HDMI connector, enabling interconnected devices (television, set-top box, console, audio amplifier, Blu-ray player) to share high-level commands (collective standby, source selection, volume control). Manufacturers often publish a proprietary CEC label (Anynet+, Bravia Sync, EasyLink, Viera Link) that designates the same standard layer with marketing branding. Interoperability gaps between brands often arise from proprietary extensions not covered by the strict specification.

ARC (Audio Return Channel), introduced in HDMI 1.4, allows a television to return audio from an internal source to an amplifier connected on the same HDMI port, using a dedicated differential pair. It is bitrate-limited and does not support uncompressed high-quality bitstreams.

eARC (Enhanced ARC), introduced in HDMI 2.1, significantly raises the bitrate of the audio return channel. It supports PCM up to 7.1 channels uncompressed, lossless Dolby TrueHD and DTS-HD Master Audio bitstreams, object-based formats Dolby Atmos and DTS:X, and automatic capability negotiation between source and sink. eARC requires at least a Premium High Speed HDMI cable with Ethernet, or an Ultra High Speed cable, to operate at full capacity.

Compliance Test Specifications and Authorized Test Centers

The certification programme rests on two pillars: a test reference published by the Forum, and a network of laboratories accredited by HDMI LA to run them.

The Compliance Test Specifications (CTS) are technical documents published by the Forum that translate the HDMI specification into concrete test cases: environmental conditions, Device Under Test configurations, required measurement equipment, pass criteria. Several CTS coexist for each version (Source CTS, Sink CTS, Repeater CTS, eARC CTS, Cable CTS).

An Authorized Test Center (ATC) is an independent laboratory accredited by HDMI LA to run the CTS. ATCs are distributed worldwide, primarily in North America, Europe and Asia. Accreditation is differentiated by CTS: the same ATC may be accredited for HDMI 2.0 Source CTS without being accredited for HDMI 2.1. Unlike some consortium programmes that allow self-testing, HDMI certification requires tests to be executed by an ATC: self-testing is not accepted.

Typical product certification flow

Sign the HDMI Adopter Agreement with HDMI LA, if not already in force.
Select the versions and features to certify. Identify the target HDMI version (2.0, 2.1, etc.), the modes (FRL or TMDS), the options (eARC, VRR, ALLM, QMS, Dynamic HDR) and the product variants.
Prepare the Device Under Test. Stabilise a firmware version and a hardware configuration representative of production. Any post-certification change not covered by the re-test perimeter triggers a re-submission.
Select an ATC accredited for the targeted CTS, define the perimeter and schedule.
Internal pre-testing where feasible, on a bench fitted with a compatible HDMI generator and analyser, to reduce the risk of failing at the ATC.
Formal test execution by the ATC against the applicable CTS.
Submit the dossier to HDMI LA: ATC report, declaration of conformity, certification fees.
HDMI LA review and certificate issuance. The product receives a certification identifier.
Right to apply the trademark and logos in line with the HDMI Brand Style Guide.
Maintenance. Any hardware or firmware change affecting the HDMI layer must be assessed: depending on its perimeter, either a derivation declaration or a re-certification is required.

This sequence runs in parallel with the regulatory testing (EMC, electrical safety) imposed by CE marking in the EU or by the FCC in the United States. HDMI tests cover neither EMC, nor safety, nor any PSTI or cybersecurity requirements that may apply.

Common pitfalls

Equating an HDMI 2.1 chipset with an HDMI 2.1 certified product

The most widespread pitfall. A chipset capable of FRL and Dynamic HDR does not imply that the finished product is HDMI 2.1 certified. PCB layout, connector quality, power supply and the firmware integrating the HDMI stack must pass the CTS in an ATC. Several televisions and amplifiers placed on the market with an HDMI 2.1 mention have been flagged for incomplete features (reduced bitrate, missing VRR, non-functional ALLM), often due to platform compromises not covered by strict certification.

Conflating product certification and cable certification

A television certified HDMI 2.1 and a cable certified Ultra High Speed HDMI are two independent certifications. Shipping an 8K television without an Ultra High Speed cable in the box can cap the actual experience at 18 Gbps.

Buying or shipping non-certified cables

The HDMI cable market is saturated with products advertising 8K or 48 Gbps without Ultra High Speed certification. For an integrator that ships a cable in the box, only Ultra High Speed certified cables guarantee an experience matching the packaging claim.

Underestimating the HDCP contract

A product certified HDMI but lacking a valid HDCP agreement cannot display encrypted premium content. HDCP is administered by DCP LLC, with its own signing cycle, its own fees and its own robustness rules. Decoupling it from the HDMI LA schedule leads to a product that is technically certified but commercially incomplete.

Jumping specification versions without re-evaluation

An HDMI 2.0 certification does not cover HDMI 2.1. Activating FRL by firmware on a product previously certified 2.0 without a new submission has no contractual value vis-a-vis HDMI LA, even when the chipset allows it technically.

Underestimating EMC at 48 Gbps

Moving to FRL imposes EMC constraints noticeably tighter than TMDS. PCB layout, shielding, cable filtering and coupling on the connector side become critical. A design that passed EN 55032 class B at version 2.0 may fail at 2.1 if integration is not revisited. See CE tests for the EMI and immunity tests applicable.

Forgetting that CEC and eARC are optional

A product may be HDMI 2.1 certified without implementing CEC or eARC. A manufacturer that advertises them without related certification exposes the product to disputes. The simple rule: claim only features that are certified.

Confusing HDMI with other consortium video standards

USB Type-C with DP Alt mode, Thunderbolt and DisplayPort are parallel regimes, managed by other organisations (USB-IF, VESA). A product combining HDMI and USB Type-C must combine the corresponding certifications. See USB-IF and USB-C certification.

Relationship with CE marking and FCC

HDMI certification in no way replaces the regulatory obligations applicable to the product. In the European Union, audiovisual equipment must meet the EMC Directive (2014/30/UE) via EN 55032 emissions and EN 55035 immunity, the Low Voltage Directive (2014/35/UE) via EN IEC 62368-1, where applicable the RoHS Directive (2011/65/UE), and the RED Directive if the product integrates a radio transmitter (see RED pillar). In the United States, FCC Part 15 subpart B applies in residential environments.