Stop double-counting a named forensic mark as SynthID provenance

A manifest that names its own forensic soft-binding algorithm carries
that vendor's mark; the generic watermark-action vendor-token inference
must not add a second, differently-attributed invisible watermark from
the same bytes. Microsoft Designer manifests triggered exactly that:
signed by Microsoft, watermarked by InvisMark, with the generation
agent named "Azure OpenAI ImageGen" - the OpenAI issuer token inside
that service name plus the InvisMark watermarked action satisfied the
OpenAI SynthID-evidence rule, and identify reported one forensic mark
as two paid pixel watermarks.

Three changes, one rule at every inference site (the verdict-scan
comment's own lesson: a rule that lives in only one copy is a rule the
others silently lack):

- c2pa.py structured path: SynthID evidence now scopes to the
  signer/generator identity strings only (signature issuer, claim
  generator), never the raw chain, and is suppressed entirely when a
  soft-binding algorithm is named.
- c2pa.py byte fallback and metadata.py synthid_source: suppressed when
  the scan names a soft-binding algorithm.
- identify.py verdict scan: same suppression.

Gemini and ChatGPT originals keep their provenance-asserted SynthID
strings; the Designer regression is pinned by
test_designer_synthid_suppression.py (agent name alone is not the
vendor's provenance, and a named soft binding suppresses the
inference).

pyproject.toml

@@ -4,7 +4,7 @@
 # on it, including the ComfyUI node package. The console script below carries
 # the same weight, since users have it on PATH.
 name = "remove-ai-watermarks"
-version = "0.32.0"
+version = "0.32.1"
 description = "AI watermark remover for visible, invisible, and provenance marks in images and video"
 readme = "README.md"
 requires-python = ">=3.11,<3.15"

src/remove_ai_watermarks/__init__.py

@@ -32,7 +32,7 @@ _os.environ.setdefault("TRANSFORMERS_VERBOSITY", "error")
 _warnings.filterwarnings("ignore", message=r".*ImageProcessorFast.*")
 
 
-__version__ = "0.32.0"
+__version__ = "0.32.1"
 
 __all__ = [
     "BatchSummary",

src/remove_ai_watermarks/_internal/c2pa.py

@@ -426,6 +426,11 @@ def _structured_manifest_fields(store: dict[str, Any]) -> dict[str, Any]:
     source_types: list[str] = []
     soft_binding_algorithms: list[str] = []
     soft_binding_values: list[str] = []
+    # Raw signer/generator identity strings, used to scope SynthID evidence to
+    # the vendor that actually asserted the manifest. A vendor token appearing
+    # anywhere else in the chain (e.g. Microsoft Designer's "Azure OpenAI
+    # ImageGen" softwareAgent) is a service name, not that vendor's provenance.
+    identity_strings: list[str] = []
     claim_generator_asserts_ai = False
 
     def add_tool_matches(value: str, *, asserts_ai: bool = False) -> None:
@@ -443,9 +448,11 @@ def _structured_manifest_fields(store: dict[str, Any]) -> dict[str, Any]:
                 value = signature.get(key)
                 if isinstance(value, str):
                     issuers.extend(_ordered_matches(value.encode(), C2PA_ISSUERS))
+                    identity_strings.append(value)
 
         direct_generator = manifest.get("claim_generator")
         if isinstance(direct_generator, str):
+            identity_strings.append(direct_generator)
             add_tool_matches(direct_generator, asserts_ai=True)
 
         candidates = manifest.get("claim_generator_info")
@@ -456,6 +463,7 @@ def _structured_manifest_fields(store: dict[str, Any]) -> dict[str, Any]:
                 name = cast("dict[object, object]", candidate_value).get("name")
                 if isinstance(name, str):
                     add_tool_matches(name, asserts_ai=True)
+                    identity_strings.append(name)
 
         assertions = manifest.get("assertions")
         if not isinstance(assertions, list):
@@ -528,9 +536,14 @@ def _structured_manifest_fields(store: dict[str, Any]) -> dict[str, Any]:
     has_watermark_action = any(action.startswith("watermarked") for action in actions)
     if has_watermark_action:
         info["watermarked"] = True
-    if info.get("ai_source_kind"):
-        selected_bytes = json.dumps(chain, ensure_ascii=False).encode()
-        synthid = synthid_evidence_vendors_in(selected_bytes, has_watermark_action=has_watermark_action)
+    if info.get("ai_source_kind") and not soft_binding_algorithms:
+        # Evidence scope: only the signer/generator identity strings above, never
+        # the whole chain - a vendor named inside another vendor's manifest (the
+        # Designer case) must not turn into that vendor's SynthID provenance. A
+        # manifest that names its own forensic soft-binding algorithm carries
+        # that vendor's mark and is excluded from the generic inference entirely.
+        identity_bytes = json.dumps(identity_strings, ensure_ascii=False).encode()
+        synthid = synthid_evidence_vendors_in(identity_bytes, has_watermark_action=has_watermark_action)
         if synthid:
             info["synthid_vendors"] = synthid
             info["synthid_watermark"] = synthid_verdict(", ".join(synthid))
@@ -611,7 +624,11 @@ def _populate_registry_fields(buffer: bytes, info: dict[str, Any]) -> bool:
 
     if b"c2pa.watermarked" in buffer:
         info["watermarked"] = True
-    synthid = synthid_evidence_vendors_in(buffer, has_watermark_action=info.get("watermarked", False))
+    synthid = (
+        []
+        if soft_binding_vendors_in(buffer)
+        else synthid_evidence_vendors_in(buffer, has_watermark_action=info.get("watermarked", False))
+    )
     if ai_source and synthid:
         info["synthid_vendors"] = synthid
         info["synthid_watermark"] = synthid_verdict(", ".join(synthid))

src/remove_ai_watermarks/identify.py

@@ -1273,7 +1273,19 @@ def _identify_from_evidence(
     # reusing the derived `has_c2pa` / `source_kind` above, which are broader:
     # the file path's answer must not move.
     trained_source = b"trainedAlgorithmicMedia" in head or b"TrainedAlgorithmicMedia" in head
-    if not synthid and trained_source and c2pa_marker_in(head) and (vendors := synthid_evidence_vendors_in(region)):
+    # Same suppression as every other inference site: bytes that name their own
+    # forensic soft-binding algorithm carry that vendor's mark, and the generic
+    # vendor-token inference must not add a second, differently-attributed
+    # invisible watermark (Microsoft Designer: "Azure OpenAI ImageGen" agent +
+    # the InvisMark watermarked action read as "SynthID per OpenAI").
+
+    if (
+        not synthid
+        and trained_source
+        and c2pa_marker_in(head)
+        and not soft_binding_vendors_in(region)
+        and (vendors := synthid_evidence_vendors_in(region))
+    ):
         synthid = synthid_verdict(", ".join(vendors))
     if synthid:
         watermarks.append(

src/remove_ai_watermarks/metadata.py

@@ -839,6 +839,13 @@ def synthid_source(image_path: Path, *, c2pa_info: dict[str, Any] | None = None)
     ai_source = b"trainedAlgorithmicMedia" in data or b"TrainedAlgorithmicMedia" in data
     if not (has_c2pa and ai_source):
         return None
+    from remove_ai_watermarks._internal.c2pa import soft_binding_vendors_in
+
+    # A scan that names its own forensic soft-binding algorithm carries that
+    # vendor's mark; the generic vendor-token inference must not add a second,
+    # differently-attributed invisible watermark from the same bytes.
+    if soft_binding_vendors_in(data):
+        return None
     matched = synthid_evidence_vendors_in(data)
     return ", ".join(matched) if matched else None
 

tests/test_designer_synthid_suppression.py

@@ -0,0 +1,85 @@
+"""Regression: a manifest that names its own forensic soft binding must not
+also report a SynthID watermark from the generic vendor-token inference.
+
+Microsoft Designer manifests sign as Microsoft, carry the InvisMark
+``c2pa.watermarked`` action, and name their generation agent
+"Azure OpenAI ImageGen". The OpenAI issuer token inside that agent name plus
+the watermarked action used to satisfy the OpenAI SynthID-evidence rule,
+double-counting one forensic mark as two pixel watermarks.
+"""
+
+from __future__ import annotations
+
+from remove_ai_watermarks._internal.c2pa import c2pa_info_from_manifest_store
+
+DESIGNER_STORE = {
+    "active_manifest": "designer",
+    "manifests": {
+        "designer": {
+            "signature_info": {"issuer": "Microsoft Corporation", "common_name": "Microsoft Corporation"},
+            "claim_generator_info": [{"name": "Microsoft Responsible AI Provenance", "version": "1.0"}],
+            "assertions": [
+                {
+                    "label": "c2pa.actions",
+                    "data": {
+                        "actions": [
+                            {
+                                "action": "c2pa.created",
+                                "softwareAgent": {"name": "Azure OpenAI ImageGen"},
+                                "digitalSourceType": "http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia",
+                            },
+                            {"action": "c2pa.watermarked"},
+                        ]
+                    },
+                },
+                {
+                    "label": "c2pa.soft-binding",
+                    "data": {"alg": "com.microsoft.invismark.1", "blocks": [{"value": "bf7a2993-cc1f-47e1-b1f0-cd8839aabb22"}]},
+                },
+            ],
+        }
+    },
+}
+
+
+def test_named_soft_binding_suppresses_generic_synthid_evidence() -> None:
+    info = c2pa_info_from_manifest_store(DESIGNER_STORE)
+    assert info["ai_source_kind"] == "generated"
+    assert info["soft_binding_algorithm"] == "com.microsoft.invismark.1"
+    assert info.get("synthid_watermark") is None
+    assert info.get("synthid_vendors") is None
+
+
+def test_vendor_agent_name_alone_is_not_the_vendors_provenance() -> None:
+    """The identity-scoped inference must not fire on a service name either.
+
+    Same manifest without the soft binding: the "Azure OpenAI ImageGen" agent
+    is not an OpenAI signature or claim generator, so no OpenAI SynthID
+    evidence may be derived from it.
+    """
+    store = {
+        "active_manifest": "designer",
+        "manifests": {
+            "designer": {
+                "signature_info": {"issuer": "Microsoft Corporation", "common_name": "Microsoft Corporation"},
+                "claim_generator_info": [{"name": "Microsoft Responsible AI Provenance", "version": "1.0"}],
+                "assertions": [
+                    {
+                        "label": "c2pa.actions",
+                        "data": {
+                            "actions": [
+                                {
+                                    "action": "c2pa.created",
+                                    "softwareAgent": {"name": "Azure OpenAI ImageGen"},
+                                    "digitalSourceType": "http://cv.iptc.org/newscodes/digitalsourcetype/trainedAlgorithmicMedia",
+                                },
+                                {"action": "c2pa.watermarked"},
+                            ]
+                        },
+                    }
+                ],
+            }
+        },
+    }
+    info = c2pa_info_from_manifest_store(store)
+    assert info.get("synthid_watermark") is None

uv.lock

@@ -288,7 +288,7 @@ wheels = [
 
 [[package]]
 name = "c2pa-python"
-version = "0.37.7"
+version = "0.37.8"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "cryptography" },
@@ -298,15 +298,15 @@ dependencies = [
     { name = "toml" },
     { name = "wheel" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/1f/32/e93959d17db5af4078532f587b9638e87b6429ca0b51348a8ac6ad99e471/c2pa_python-0.37.8.tar.gz", hash = "sha256:c52eb07244558a5997fe61b6ed8d879b4f46f38642dd11956bcedf888c58649c", size = 113008, upload-time = "2026-08-27T20:40:06.081Z" }
 wheels = [
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 ]
 
 [[package]]
@@ -546,14 +546,11 @@ wheels = [
 
 [[package]]
 name = "click"
-version = "8.4.2"
+version = "8.5.0"
 source = { registry = "https://pypi.org/simple" }
-dependencies = [
-    { name = "colorama", marker = "sys_platform == 'win32'" },
-]
-sdist = { url = "https://files.pythonhosted.org/packages/76/d4/81420972a676e8ffea40450d8c8c92943e7218a78fe9b64359836cc9876b/click-8.4.2.tar.gz", hash = "sha256:9a6cea6e60b17ebe0a44c5cc636d94f09bd66142c1cd7d8b4cd731c4917a15f6", size = 338000, upload-time = "2026-06-24T17:45:15.148Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/c7/0e/7fa0ef50764b67090eca4114772a2abf8b6148198475e54c660b97caeee6/click-8.5.0.tar.gz", hash = "sha256:ba0d2089de75ea0310e2dde03160e6ca10009947fb95a182f9b54021bb272e34", size = 382235, upload-time = "2026-08-26T13:33:14.56Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/58/50/6c0d534c5f134586a8e1ba4e330569e32f057e33372ae556463212fb4cd3/click-8.5.0-py3-none-any.whl", hash = "sha256:255bc9599cf7748b4b1a446ccc735421bd08a2ae529a8b88597d3de5664ee360", size = 125251, upload-time = "2026-08-26T13:33:12.928Z" },
 ]
 
 [[package]]
@@ -794,7 +791,7 @@ name = "cuda-bindings"
 version = "13.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "cuda-pathfinder" },
+    { name = "cuda-pathfinder", marker = "sys_platform != 'darwin' and sys_platform != 'emscripten' and sys_platform != 'win32'" },
 ]
 wheels = [
     { url = "https://files.pythonhosted.org/packages/51/6b/457ca12dad3ee9bfcc9a545cfd6b64b359ba49de40f776f6e028e678f262/cuda_bindings-13.3.1-cp311-cp311-manylinux_2_24_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:c5879712accf6e14bb01aa5e67440eb84998b8d104b509cc7a6dc0b8f656a474", size = 6053539, upload-time = "2026-05-29T23:11:43.19Z" },
@@ -827,43 +824,43 @@ wheels = [
 
 [package.optional-dependencies]
 cublas = [
-    { name = "nvidia-cublas", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
-    { name = "nvidia-cuda-nvrtc", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
+    { name = "nvidia-cublas", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
+    { name = "nvidia-cuda-nvrtc", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
 ]
 cudart = [
-    { name = "nvidia-cuda-runtime", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
+    { name = "nvidia-cuda-runtime", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
 ]
 cufft = [
-    { name = "nvidia-cufft", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
-    { name = "nvidia-nvjitlink", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
+    { name = "nvidia-cufft", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
+    { name = "nvidia-nvjitlink", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
 ]
 cufile = [
-    { name = "nvidia-cufile", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
+    { name = "nvidia-cufile", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
 ]
 cupti = [
-    { name = "nvidia-cuda-cupti", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
+    { name = "nvidia-cuda-cupti", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
 ]
 curand = [
-    { name = "nvidia-curand", marker = "platform_machine == 'aarch64' or platform_machine == 'x86_64'" },
+    { name = "nvidia-curand", marker = "(platform_machine == 'aarch64' and sys_platform == 'linux') or (platform_machine == 'x86_64' and sys_platform == 'linux')" },
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