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‎README.md‎

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C2PA specifies a mechanism for recovering a decoupled C2PA Manifest using soft bindings (for example an invisible watermark or content fingerprint). The soft binding assertion contains a field 'alg' that serves to uniquely identify the algorithm used to compute the soft binding. The Soft Binding Algorithm List is an authoritative list of soft binding algorithm names that may be used as identifiers within the 'alg' field. Entries in the list also contain additional information on the algorithms.
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Developers of soft binding algorithms may request these be added as a new entries in the soft binding algorithm list. Developers may also request amendments to their entries. These requests may be made by submitting a pull request (PR) adding to or editing the [softbinding-algorithm-list JSON document](softbinding-algorithm-list.json) in this repository. The C2PA Technical Working Group may approve and merge PRs in accordance with its prevailing processes for approving technical contributions to the C2PA specification. C2PA's Technical Working Group may also decide to remove malicious or non-conformant algorithms from the list of approved soft binding algorithms.
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Developers of soft binding algorithms may request these be added as a new entries in the soft binding algorithm list. Developers may also request amendments to their entries. These requests may be made by submitting a pull request (PR) adding to or editing the [softbinding-algorithm-list JSON array](softbinding-algorithm-list.json) in this repository and following the [entry schema](softbinding-algorithm-entry-schema.json).
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The C2PA Technical Working Group may approve and merge PRs in accordance with its prevailing processes for approving technical contributions to the C2PA specification. C2PA's Technical Working Group may also decide to remove malicious or non-conformant algorithms from the list of approved soft binding algorithms.

‎softbinding-algorithm-entry-schema.json‎

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{
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"$schema": "https://json-schema.org/draft/2020-12/schema",
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"type": "object",
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"properties": {
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"identifier": {
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"type": "integer",
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"minimum": 0,
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"maximum": 65535,
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"description": "This identifier will be assigned when the soft binding algorithm is added to the list."
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},
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"alg": {
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"type": "string",
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"pattern": "(c2pa\\.|[A-Za-z0-9\\-\\.]+)",
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"description": "Entity-specific namespace as specified for C2PA Assertions labels that shall begin with the Internet domain name for the entity similar to how Java packages are defined (e.g., `com.example.algo1`, `net.example.algos.algo2`)"
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},
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"type": {
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"type": "string",
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"enum": [
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"watermark",
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"fingerprint"
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],
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"description": "Type of soft binding implemented by this algorithm."
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},
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"decodedMediaTypes": {
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"type": "array",
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"minItems": 1,
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"items": {
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"type": "string",
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"enum": [
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"application",
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"audio",
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"image",
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"model",
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"text",
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"video"
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],
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"description": "IANA top level media type (rendered) for which this soft binding algorithm applies."
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}
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},
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"encodedMediaTypes": {
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"type": "array",
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"minItems": 1,
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"items": {
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"type": "string",
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"description": "IANA media type for which this soft binding algorithm applies, e.g., application/pdf",
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"pattern": "^([a-zA-Z0-9\\-]+\\/[a-zA-Z0-9\\-\\+]+(?:\\.[a-zA-Z0-9\\-\\+]+)*)$"
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}
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},
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"entryMetadata": {
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"type": "object",
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"properties": {
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"description": {
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"type": "string",
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"description": "Human readable description of the algorithm."
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},
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"dateEntered": {
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"type": "string",
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"format": "date-time",
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"description": "Date of entry for this algorithm."
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},
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"contact": {
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"type": "string",
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"format": "email"
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},
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"informationalUrl": {
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"type": "string",
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"format": "uri",
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"description": "A web page containing more details about the algorithm."
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}
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},
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"required": [
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"description",
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"dateEntered",
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"contact",
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"informationalUrl"
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]
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},
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"softBindingResolutionApis": {
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"type": "array",
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"items": {
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"type": "string",
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"format": "uri"
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},
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"description": "A list of Soft Binding Resolution APIs supporting this algorithm."
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}
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},
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"required": [
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"identifier",
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"alg",
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"type",
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"entryMetadata"
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],
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"oneOf": [
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{
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"required": [
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"decodedMediaTypes"
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]
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},
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{
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"required": [
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"encodedMediaTypes"
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]
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}
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]
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}

‎softbinding-algorithm-list.json‎

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{
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[
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{
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"identifier": 1,
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"alg": "com.digimarc.validate.1",
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"type": "watermark",
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"decodedMediaTypes": [
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"audio",
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"video",
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"text",
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"image"
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],
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"entryMetadata": {
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"description": "Digimarc's Validate Digital Watermarking algorithm",
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"dateEntered": "2024-05-17T17:00:00.000Z",
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"contact": "[email protected]",
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"informationalUrl": "https://www.digimarc.com/products/digital-content-authentication"
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}
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},
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{
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"identifier": 2,
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"alg": "org.atsc.a336",
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"type": "watermark",
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"decodedMediaTypes": [
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"audio",
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"video",
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"image"
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],
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"entryMetadata": {
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"description": "ATSC watermarking (A/334, A/335, A/336)",
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"dateEntered": "2024-05-17T15:43:00.000Z",
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"contact": "[email protected]",
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"informationalUrl": "https://www.atsc.org/atsc-documents/a3362017-content-recovery-redistribution-scenarios/"
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}
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},
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{
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"identifier": 3,
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"alg": "io.iscc.v0",
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"type": "fingerprint",
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"decodedMediaTypes": [
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"text",
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"image",
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"audio",
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"video",
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"application"
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],
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"entryMetadata": {
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"description": "ISO 24138 - International Standard Content Code (ISCC) V0 algorithm",
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"dateEntered": "2024-05-17T16:00:00Z",
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"contact": "[email protected]",
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"informationalUrl": "https://www.iso.org/standard/77899.html"
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}
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},
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{
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"identifier": 4,
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"alg": "com.adobe.trustmark.Q",
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"type": "watermark",
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"decodedMediaTypes": [
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"image"
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],
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"entryMetadata": {
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"description": "Adobe Trustmark variant Q",
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"dateEntered": "2024-05-17T17:00:00.000Z",
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"contact": "[email protected]",
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"informationalUrl": "https://github.com/adobe/trustmark/"
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}
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},
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{
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"identifier": 5,
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"alg": "com.adobe.trustmark.C",
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"type": "watermark",
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"decodedMediaTypes": [
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"image"
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],
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"entryMetadata": {
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"description": "Adobe Trustmark variant C",
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"dateEntered": "2024-05-17T17:00:00.000Z",
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"contact": "[email protected]",
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"informationalUrl": "https://github.com/adobe/trustmark/"
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}
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},
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{
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"identifier": 6,
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"alg": "com.adobe.icn.dense",
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"type": "fingerprint",
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"decodedMediaTypes": [
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"image"
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],
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"entryMetadata": {
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"description": "Adobe Image Comparator Network Dense Fingerprint",
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"dateEntered": "2024-05-17T17:00:00.000Z",
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"contact": "[email protected]",
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"informationalUrl": "https://openaccess.thecvf.com/content/CVPR2021W/WMF/html/Black_Deep_Image_Comparator_Learning_To_Visualize_Editorial_Change_CVPRW_2021_paper.html"
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}
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},
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{
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"identifier": 7,
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"deprecated": false,
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"alg": "ai.steg.api",
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}
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}
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]
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}

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