Question on labeling of declassified documents

I'm familiar with the general rules at the NARA about correctly making copies of documents with classified markings, specifically eCFR — Code of Federal Regulations 1254.76 and 2001.25: Declassification markings.   Does the "copies of records" clause in 2001.25 require that any subsequent document using some or all of the information in the original record also preserve and propagate the declassification information?  As a concrete hypothetical, let's take a declassified missile range map from the Cold War (and assume it's public domain, seeing as access and use are both "Unrestricted").  If a website wanted to reproduce that figure without either the canceled classification stamp or the declassification authority information would that be acceptable? Or would any "derivative" graphic based on that original be obligated to keep the declassification information with it regardless, since the original from which the unmarked version is derived was originally marked TS?  I realize this question probably doesn't come up a lot, since most users of this type of material prefer to preserve the evidence of its restricted history in order to heighten audience interest, but the language of 1254.76 feels like it is primarily concerned with copies while in and leaving physical NARA sites and I was wondering if someone at the NARA could clarify what the actual labeling requirements are in subsequent use.