Yes, Objects in Salesforce have audit fields (CreatedByID, CreatedDate, LastModifiedbyID, LastModifiedDate) that are read-only by default as they are populated by Salesforce upon creation or modifications of records. If you would like to restore Audit fields, you can do that from the Salesforce.com setup page: Enable "Set Audit Fields upon Record Creation" and "Update Records with Inactive Owners"
More information can be found in the following KB article:
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