M
Matt
SharePoint 2007 document libraries appear to be writing hidden data into Word
documents that causes the digital signatures in the document to become
invalid (because the document appears to have been modified).
Specifically, digitally signed documents authored/signed with Word 2003
become invalid. However, digitally signed documents authored/signed with
Word 2007 do not – they are able to maintain their validity.
Here is a sample of actions that can cause a Word digital signature to
become invalid:
• Uploading a digitally signed document from the desktop into a SharePoint
2007 document library.
• Starting a workflow on a document library, if it is the first time that
workflow has been used on the library, will invalidate the digital signatures
of every document in the library.
• Editing the Association of a workflow template with a document library
will invalidate the digital signatures of every document in the library.
• Adding new columns to the document library will invalidate the digital
signature of every document in the library.
• Editing the properties of a document will invalidate the digital signature
of the document.
• Events that write data to a property of a document when it is
saved/updated will invalidate the digital signature of the document.
We are hoping someone can help us with this issue. We are using a Microsoft
Partner’s digital signature solution in our software and their signatures are
becoming invalid too during the course of interacting with SharePoint 2007
document libraries. They are looking for advice on what part of the document
SharePoint is changing that is causing their signatures to invalidate.
documents that causes the digital signatures in the document to become
invalid (because the document appears to have been modified).
Specifically, digitally signed documents authored/signed with Word 2003
become invalid. However, digitally signed documents authored/signed with
Word 2007 do not – they are able to maintain their validity.
Here is a sample of actions that can cause a Word digital signature to
become invalid:
• Uploading a digitally signed document from the desktop into a SharePoint
2007 document library.
• Starting a workflow on a document library, if it is the first time that
workflow has been used on the library, will invalidate the digital signatures
of every document in the library.
• Editing the Association of a workflow template with a document library
will invalidate the digital signatures of every document in the library.
• Adding new columns to the document library will invalidate the digital
signature of every document in the library.
• Editing the properties of a document will invalidate the digital signature
of the document.
• Events that write data to a property of a document when it is
saved/updated will invalidate the digital signature of the document.
We are hoping someone can help us with this issue. We are using a Microsoft
Partner’s digital signature solution in our software and their signatures are
becoming invalid too during the course of interacting with SharePoint 2007
document libraries. They are looking for advice on what part of the document
SharePoint is changing that is causing their signatures to invalidate.