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It is unclear whether clause (b) would apply in the circumstance where the CDLA-license file is not modified. For an import into OSM, the geodata must be converted from whatever source into OSM's format, and then added, whether as one or several changesets, to OSM. The substance of the data is extracted and contributed, but the original "file" as that word is conventionally understood is left unchanged. (There is no definition of "file" in the CDLA).
As for clause (c), the CDLA does not state whether credit or attribution may be preserved by linking to a webpage with details (such as <nowiki>[http://www.openstreetmap.org/copyright www.openstreetmap.org/copyright]</nowiki>), nor does it seem to prohibit such a format. Given that the steward of this license is the Linux Foundation, it may be fair to consider common open source code license attribution formats as appropriate examples. Such notices are commonly found in links, text files that accompany code, headers or comments in code files, for metadata associated with packages of code. In comparison, OSM's copyright attribution page (which normally would include the identity of the source, a link to the open license, and a link to the data where available) seems in line with the first method. The question of metadata is a little harder. One can envision a CDLA-licensed dataset that includes metadata identifying a source for each individual piece of data. Such information could be difficult to carry over into OSM, a different database format. However, changeset comments (which should identify the source for all imports) possibly can be used to preserve attribution for specific data.
=== Conclusion ===
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