[update: 9 Feb 2012. Ancestry.com tells me they are revising the glossary and the old pages should be gone within the month. Thanks!]
This screen shot is from Ancestry.com's learning center. This is their glossary definition for "secondary evidence" and "secondary source."
Apparently they've not been reading Evidence Explained, by Elizabeth Shown Mills. She (as well as others in the field, including yours truly) classifies information as:
- original or
- direct or