For some weird reasons, site owner wanted to disable out of the box workflow: Collect Signature from a particular site collection.
In SharePoint 2010, These workflows can be simple activated/deactivated from Site collection features. Refer my post Unable to find OOTB Workflows - Approval, Collect Signatures, Feedback for more info.
But in MOSS, Its little tricky. This workflows(Almost all others too) are deployed as a Feature and lives in 12 Hive.
So we can manually deactivate these features to remove default workflows in SharePoint . Here is how:
stsadm -o deactivatefeature -filename SignaturesWorkflow\Feature.xml -url http://Site-collection-URL
And if you want to enable it back:
stsadm -o activatefeature -filename SignaturesWorkflow\Feature.xml -url http://Site-collection-URL
Here is the screen once deactivated:
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