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How to read a signature validation report

A signature validation report answers four questions about a signed PDF: has it changed since it was signed, who signed it, when, and can it still be checked in years to come. Below is a real report for a signed quote, followed by what every line means.

Example report for a NomaSign(ed) quote.

Signed, and all signatures are valid

Quote Q-2026-0142 - Aurora Retail-digital-signed.pdf

523 KB · 1 page · 4 signatures · checked 14 Oct 2026, 12:00:00 UTC

Certified by NomaSign Digital SignatureValid
Time
9 Oct 2026, 11:32:15 UTC
Placement
Invisible signature
Name in the signature:
Daniel Fourie
Certificate:
NomaSign Digital Signature, YOUSOURCE SA (PTY) LTD
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 1

    Covers the document exactly as it was when signed (Rev. 1)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 1 of 7

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Only allowed additions

    Only allowed additions after this signature: 2 more signatures, form fields filled in, revocation data, document metadata and an archive timestamp

    Later versions may add the next signers' fields and signatures, revocation data and timestamps. Nothing else was added.

    Permitted changes: the certification allows filling in form fields and signing

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020

  • Time of signature: Proven by a timestamp

    Signing time proven by a trusted timestamp: 9 Oct 2026, 11:32:15 UTC

    A timestamp authority vouched for the moment of signing, so the time can't be backdated.

    Timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-03.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Signature level
The highest level: verifiable later, and the whole file is sealed with an archive timestamp (PAdES B-LTA)
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020
Signature format
ETSI.CAdES.detached
Algorithms
SHA-256, RSA
Allowed after certification
Filling in form fields and signing
Field
Original-Document-Sender-Certification
Certificate chain
  1. Signer: NomaSign Digital Signature (valid until 17 Mar 2029)
  2. Issued by: GlobalSign GCC R45 AATL CA 2020 (valid until 28 Jul 2030)
  3. Root: GlobalSign R45 AATL Root CA 2020 (valid until 28 Jul 2030)
Rev. 2: Signed by NomaSign Digital SignatureValid
Time
9 Oct 2026, 11:37:36 UTC
Placement
Signature on page 1
Name in the signature:
Naledi Mokoena
Certificate:
NomaSign Digital Signature, YOUSOURCE SA (PTY) LTD
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 2

    Covers the document exactly as it was when signed (Rev. 2)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 3 of 7

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Only allowed additions

    Only allowed additions after this signature: 1 more signature, form fields filled in, revocation data, document metadata and an archive timestamp

    Later versions may add the next signers' fields and signatures, revocation data and timestamps. Nothing else was added.

    Permitted changes: the certification allows filling in form fields and signing

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020

  • Time of signature: Proven by a timestamp

    Signing time proven by a trusted timestamp: 9 Oct 2026, 11:37:36 UTC

    A timestamp authority vouched for the moment of signing, so the time can't be backdated.

    Timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-02.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Signature level
Signature with a trusted time (PAdES B-T)Not higher because: The revocation data for the timestamp authority's certificates is missing from the file.
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020
Signature format
ETSI.CAdES.detached
Algorithms
SHA-256, RSA
Field
participant.98793372-205a-5c76-8e08-67cee75c18df.field.14088872-6284-4977-983e-0ef531f46139
Certificate chain
  1. Signer: NomaSign Digital Signature (valid until 17 Mar 2029)
  2. Issued by: GlobalSign GCC R45 AATL CA 2020 (valid until 28 Jul 2030)
  3. Root: GlobalSign R45 AATL Root CA 2020 (valid until 28 Jul 2030)
Rev. 3: Signed by NomaSign Digital SignatureValid
Time
9 Oct 2026, 11:37:54 UTC
Placement
Signature on page 1
Name in the signature:
Daniel Fourie
Certificate:
NomaSign Digital Signature, YOUSOURCE SA (PTY) LTD
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 3

    Covers the document exactly as it was when signed (Rev. 3)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 4 of 7

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Only allowed additions

    Only allowed additions after this signature: revocation data, document metadata and an archive timestamp

    Later versions may add the next signers' fields and signatures, revocation data and timestamps. Nothing else was added.

    Permitted changes: the certification allows filling in form fields and signing

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020

  • Time of signature: Proven by a timestamp

    Signing time proven by a trusted timestamp: 9 Oct 2026, 11:37:54 UTC

    A timestamp authority vouched for the moment of signing, so the time can't be backdated.

    Timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Signature level
The highest level: verifiable later, and the whole file is sealed with an archive timestamp (PAdES B-LTA)
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020
Signature format
ETSI.CAdES.detached
Algorithms
SHA-256, RSA
Field
participant.5c75acaf-ce70-5dd8-a2d0-d234c7adcebe.field.91c6b510-369b-4c5c-84fc-59fabe654fc3
Certificate chain
  1. Signer: NomaSign Digital Signature (valid until 17 Mar 2029)
  2. Issued by: GlobalSign GCC R45 AATL CA 2020 (valid until 28 Jul 2030)
  3. Root: GlobalSign R45 AATL Root CA 2020 (valid until 28 Jul 2030)
Rev. 4: Document timestamp by Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCYValid
Time
9 Oct 2026, 11:37:54 UTC
Placement
Covers the whole file
Certificate:
Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY, GlobalSign nv-sa
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 4

    Covers the document exactly as it was when signed (Rev. 4)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 7 of 7

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: None

    Nothing was added after this signature

    This is the last version of the document.

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL TimeStamping Root CA 2021

  • Timestamp: Seals the finished document

    Seals the finished document with a trusted time: 9 Oct 2026, 11:37:54 UTC

    An archive timestamp over the whole file, including the revocation data, keeps the document verifiable after the certificates in it expire.

    Document timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL TimeStamping Root CA 2021
Signature format
ETSI.RFC3161
Algorithms
SHA-256, RSA
Field
NomaSign-DocTimeStamp
Certificate chain
  1. Timestamp authority: Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY (valid until 24 Jul 2037)
  2. Root: GlobalSign R45 AATL TimeStamping Root CA 2021 (valid until 18 May 2038)

Signer identity is checked against the Adobe Approved Trust List of 24 Sept 2026 and the EU Trusted List of 14 Oct 2026. The file was checked in the browser and not uploaded.

What each line means

Every signature gets the same checks, in the same order. Each line starts with what it means for you, followed by the technical term in smaller text.

The timeline: certification, signatures, document timestamp
A well-signed document follows the same order every time: the sender certifies it, the signers sign, and a document timestamp seals the finished file. The report shows each step in that order. A step the document does not have shows as a grey row; it is not an error, but best practice is to have it.
Signed part: whole document at Rev. 2
Every save of a signed PDF adds a version on top of the last one, and the old versions stay inside the file. Like Adobe Acrobat, the report numbers the signed versions: the certification comes first, then Rev. 2 is the next signature, and so on. Saves that only add verification data or fill in fields get no number of their own.
Integrity: not modified since signing
The part of the file this signature covers is byte for byte what was signed. If even one character had changed, this line turns red: the signed content was altered. That is certain, though not always malicious: a damaged download or a program that re-saves the whole file gives the same result.
Changes after signing: only allowed additions
Later versions can add things on top: the next signer's fields and signature, revocation data, a timestamp. When the first signature is a certification, it decides what may be added. Anything else, like a new price on the page, turns the report orange: the signed versions are intact, but the document was changed in a way the signer did not allow.
Signer identity: trusted by Adobe, or qualified on the EU Trusted List
The signing certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses, or to a qualified provider on the EU Trusted List that was approved at the time of signing. If a signer isn't found, that doesn't mean it isn't trusted: the signer may use a private certificate authority, so open the file in Acrobat to be sure.
Time of signature: proven by a timestamp
A timestamp authority vouched for the moment of signing. Without one, the time comes from the clock on the signer's computer (which can be the signing provider's server); the signature stays valid, but the report shows a warning, because best practice is a trusted timestamp.
Long-term validation: enabled
The file carries everything needed to check the signature later: the certificates and the proof that they weren't revoked when it was signed. Acrobat calls this LTV enabled. Certificates expire after a few years; an LTV-enabled signature stays verifiable.

Signature levels

Under Signature details, the report names the level the signature reaches. These are the PAdES levels from the European standard for signed PDFs, lowest to highest. When a signature could reach a higher level, the report says what is missing.

  • PAdES B-BBasic signature, no trusted time
  • PAdES B-TSignature with a trusted time
  • PAdES B-LTSignature with a trusted time and everything needed to verify it later
  • PAdES B-LTAThe highest level: verifiable later, and the whole file is sealed with an archive timestamp

What a problem looks like

Here is the same quote after someone changed the total and saved the file. The old signatures are still mathematically intact, because the change was added as a new version on top. The report catches it anyway and shows it in orange: the certification only allowed fields and signatures to be added, and a new price on the page is neither. Had someone edited the signed bytes themselves, the report would be red: the signed content was altered.

Signed, but changed afterwards in a way the signer did not allow

Quote Q-2026-0142 - Aurora Retail-digital-signed (price changed).pdf

526 KB · 1 page · 4 signatures · checked 14 Oct 2026, 12:00:00 UTC

!Certified by NomaSign Digital SignatureChanged after signing
Time
9 Oct 2026, 11:32:15 UTC
Placement
Invisible signature
Name in the signature:
Daniel Fourie
Certificate:
NomaSign Digital Signature, YOUSOURCE SA (PTY) LTD
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 1

    Covers the document exactly as it was when signed (Rev. 1)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 1 of 8

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Not allowed

    Changed after this signature in a way that is not allowed: the content of page 1 was changed after Rev. 4

    The signed version itself is intact, but something was added later that the signer did not allow. Validators can differ in how strictly they apply these rules; Adobe Acrobat marks it as invalid.

    Unpermitted change

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020

  • Time of signature: Proven by a timestamp

    Signing time proven by a trusted timestamp: 9 Oct 2026, 11:32:15 UTC

    A timestamp authority vouched for the moment of signing, so the time can't be backdated.

    Timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-03.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Signature level
The highest level: verifiable later, and the whole file is sealed with an archive timestamp (PAdES B-LTA)
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020
Signature format
ETSI.CAdES.detached
Algorithms
SHA-256, RSA
Allowed after certification
Filling in form fields and signing
Field
Original-Document-Sender-Certification
Certificate chain
  1. Signer: NomaSign Digital Signature (valid until 17 Mar 2029)
  2. Issued by: GlobalSign GCC R45 AATL CA 2020 (valid until 28 Jul 2030)
  3. Root: GlobalSign R45 AATL Root CA 2020 (valid until 28 Jul 2030)
!Rev. 2: Signed by NomaSign Digital SignatureChanged after signing
Time
9 Oct 2026, 11:37:36 UTC
Placement
Signature on page 1
Name in the signature:
Naledi Mokoena
Certificate:
NomaSign Digital Signature, YOUSOURCE SA (PTY) LTD
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 2

    Covers the document exactly as it was when signed (Rev. 2)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 3 of 8

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Not allowed

    Changed after this signature in a way that is not allowed: the content of page 1 was changed after Rev. 4

    The signed version itself is intact, but something was added later that the signer did not allow. Validators can differ in how strictly they apply these rules; Adobe Acrobat marks it as invalid.

    Unpermitted change

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020

  • Time of signature: Proven by a timestamp

    Signing time proven by a trusted timestamp: 9 Oct 2026, 11:37:36 UTC

    A timestamp authority vouched for the moment of signing, so the time can't be backdated.

    Timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-02.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Signature level
Signature with a trusted time (PAdES B-T)Not higher because: The revocation data for the timestamp authority's certificates is missing from the file.
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020
Signature format
ETSI.CAdES.detached
Algorithms
SHA-256, RSA
Field
participant.98793372-205a-5c76-8e08-67cee75c18df.field.14088872-6284-4977-983e-0ef531f46139
Certificate chain
  1. Signer: NomaSign Digital Signature (valid until 17 Mar 2029)
  2. Issued by: GlobalSign GCC R45 AATL CA 2020 (valid until 28 Jul 2030)
  3. Root: GlobalSign R45 AATL Root CA 2020 (valid until 28 Jul 2030)
!Rev. 3: Signed by NomaSign Digital SignatureChanged after signing
Time
9 Oct 2026, 11:37:54 UTC
Placement
Signature on page 1
Name in the signature:
Daniel Fourie
Certificate:
NomaSign Digital Signature, YOUSOURCE SA (PTY) LTD
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 3

    Covers the document exactly as it was when signed (Rev. 3)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 4 of 8

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Not allowed

    Changed after this signature in a way that is not allowed: the content of page 1 was changed after Rev. 4

    The signed version itself is intact, but something was added later that the signer did not allow. Validators can differ in how strictly they apply these rules; Adobe Acrobat marks it as invalid.

    Unpermitted change

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020

  • Time of signature: Proven by a timestamp

    Signing time proven by a trusted timestamp: 9 Oct 2026, 11:37:54 UTC

    A timestamp authority vouched for the moment of signing, so the time can't be backdated.

    Timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Signature level
The highest level: verifiable later, and the whole file is sealed with an archive timestamp (PAdES B-LTA)
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL Root CA 2020
Signature format
ETSI.CAdES.detached
Algorithms
SHA-256, RSA
Field
participant.5c75acaf-ce70-5dd8-a2d0-d234c7adcebe.field.91c6b510-369b-4c5c-84fc-59fabe654fc3
Certificate chain
  1. Signer: NomaSign Digital Signature (valid until 17 Mar 2029)
  2. Issued by: GlobalSign GCC R45 AATL CA 2020 (valid until 28 Jul 2030)
  3. Root: GlobalSign R45 AATL Root CA 2020 (valid until 28 Jul 2030)
!Rev. 4: Document timestamp by Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCYChanged after signing
Time
9 Oct 2026, 11:37:54 UTC
Placement
Covers the whole file
Certificate:
Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY, GlobalSign nv-sa
Added by
Added by NomaSign: it matches the NomaSign evidence in the file.
  • Signed part: Whole document at Rev. 4

    Covers the document exactly as it was when signed (Rev. 4)

    A signature covers every byte of the document as it was at that moment, except the slot that holds the signature itself.

    Signature byte range: saved version 7 of 8

  • Integrity: Not modified since signing

    Document has not been modified since this signature was applied

    The signed bytes were hashed and compared with the hash inside the signature, and the signature was verified with the signer's public key. Both match.

    Hash and signature verified

  • Changes after signing: Not allowed

    Changed after this signature in a way that is not allowed: the content of page 1 was changed after Rev. 4

    The signed version itself is intact, but something was added later that the signer did not allow. Validators can differ in how strictly they apply these rules; Adobe Acrobat marks it as invalid.

    Unpermitted change

  • Signer identity: Trusted by Adobe

    Signed with a certificate that Adobe trusts

    The signer's certificate leads up to a certificate authority on the Adobe Approved Trust List, the list Adobe Acrobat uses.

    Adobe Approved Trust List: GlobalSign R45 AATL TimeStamping Root CA 2021

  • Timestamp: Seals the finished document

    Seals the finished document with a trusted time: 9 Oct 2026, 11:37:54 UTC

    An archive timestamp over the whole file, including the revocation data, keeps the document verifiable after the certificates in it expire.

    Document timestamp from Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY

  • Long-term validation: Enabled

    Can still be verified in years to come, even offline

    The file carries the certificates and the proof that they were not revoked at the time of signing, so the signature stays verifiable after the certificates expire.

    LTV enabled

Signature details
Trusted through
Adobe Approved Trust List: GlobalSign R45 AATL TimeStamping Root CA 2021
Signature format
ETSI.RFC3161
Algorithms
SHA-256, RSA
Field
NomaSign-DocTimeStamp
Certificate chain
  1. Timestamp authority: Globalsign TSA for AATL - R45 - 2026 TSU-01.001-LCY (valid until 24 Jul 2037)
  2. Root: GlobalSign R45 AATL TimeStamping Root CA 2021 (valid until 18 May 2038)

Signer identity is checked against the Adobe Approved Trust List of 24 Sept 2026 and the EU Trusted List of 14 Oct 2026. The file was checked in the browser and not uploaded.

Want to see this in Adobe Acrobat instead? The ten-second test shows what each Acrobat message means, and the Proof File is a real NomaSign(ed) document you can check yourself.

Questions about validation reports

Was my file uploaded to make this report?
No. The report is made in the browser of whoever checked the file. A shared report link carries the report itself after the # in the address, and that part never reaches a server.
Why does a signature say valid when the certificate has expired?
A signature is checked for the moment it was made. If the certificate was valid then, and the file carries the proof (LTV), the signature stays valid after the certificate expires. Adobe Acrobat works the same way.
What is the difference between a certification and a signature?
A certification is the first signature on a document and sets what may change afterwards, for example only filling in fields and signing. Approval signatures are the signers' own signatures that follow.
Should I still check the file in Adobe Acrobat?
For anything the report marks as unknown or unsupported, yes. Adobe Acrobat Reader is free and is the reference for signed PDFs.

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