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https://github.com/wiltodelta/remove-ai-watermarks.git
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122 lines
4.8 KiB
Python
122 lines
4.8 KiB
Python
"""Regression: a manifest that names its own watermark soft binding must not
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also report a SynthID watermark from the generic vendor-token inference.
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Microsoft Designer manifests sign as Microsoft, carry the InvisMark
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``c2pa.watermarked`` action, and name their generation agent
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"Azure OpenAI ImageGen". The OpenAI issuer token inside that agent name plus
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the watermarked action used to satisfy the OpenAI SynthID-evidence rule,
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double-counting one forensic mark as two pixel watermarks.
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"""
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from __future__ import annotations
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from remove_ai_watermarks._internal.c2pa import c2pa_info_from_manifest_store
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DESIGNER_STORE = {
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"active_manifest": "designer",
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"manifests": {
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"designer": {
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"signature_info": {"issuer": "Microsoft Corporation", "common_name": "Microsoft Corporation"},
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"claim_generator_info": [{"name": "Microsoft Responsible AI Provenance", "version": "1.0"}],
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"assertions": [
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{
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"label": "c2pa.actions",
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"data": {
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"actions": [
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{
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"action": "c2pa.created",
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"softwareAgent": {"name": "Azure OpenAI ImageGen"},
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"digitalSourceType": "http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia",
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},
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{"action": "c2pa.watermarked"},
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]
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},
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},
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{
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"label": "c2pa.soft-binding",
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"data": {
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"alg": "com.microsoft.invismark.1",
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"blocks": [{"value": "bf7a2993-cc1f-47e1-b1f0-cd8839aabb22"}],
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},
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},
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],
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}
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},
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}
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def test_named_watermark_soft_binding_suppresses_generic_synthid_evidence() -> None:
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info = c2pa_info_from_manifest_store(DESIGNER_STORE)
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assert info["ai_source_kind"] == "generated"
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assert info["soft_binding_algorithm"] == "com.microsoft.invismark.1"
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assert info.get("synthid_watermark") is None
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assert info.get("synthid_vendors") is None
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def test_content_fingerprint_does_not_suppress_google_synthid_evidence() -> None:
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store = {
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"active_manifest": "google",
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"manifests": {
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"google": {
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"signature_info": {"issuer": "Google LLC"},
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"assertions": [
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{
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"label": "c2pa.actions",
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"data": {
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"actions": [
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{
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"action": "c2pa.created",
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"digitalSourceType": (
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"http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia"
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),
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}
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]
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},
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},
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{"label": "c2pa.soft-binding", "data": {"alg": "io.iscc.v0"}},
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],
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}
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},
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}
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info = c2pa_info_from_manifest_store(store)
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assert info["soft_binding"] == "ISCC (content code)"
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assert info["synthid_vendors"] == ["Google LLC"]
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assert info["synthid_watermark"] == "present according to Google LLC provenance"
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def test_vendor_agent_name_alone_is_not_the_vendors_provenance() -> None:
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"""The identity-scoped inference must not fire on a service name either.
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Same manifest without the soft binding: the "Azure OpenAI ImageGen" agent
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is not an OpenAI signature or claim generator, so no OpenAI SynthID
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evidence may be derived from it.
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"""
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store = {
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"active_manifest": "designer",
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"manifests": {
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"designer": {
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"signature_info": {"issuer": "Microsoft Corporation", "common_name": "Microsoft Corporation"},
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"claim_generator_info": [{"name": "Microsoft Responsible AI Provenance", "version": "1.0"}],
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"assertions": [
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{
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"label": "c2pa.actions",
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"data": {
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"actions": [
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{
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"action": "c2pa.created",
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"softwareAgent": {"name": "Azure OpenAI ImageGen"},
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"digitalSourceType": "http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia",
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},
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{"action": "c2pa.watermarked"},
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]
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},
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}
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],
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}
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},
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}
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info = c2pa_info_from_manifest_store(store)
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assert info.get("synthid_watermark") is None
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