Theses are usually much different from documentation, there is probably no need for FDL for it since FDL-licensed documentation won't be based on it (nor CC0-licensed h-node documentation). There are many areas for writings that don't need to be adapted for modified versions of software, the arguments for making documentation free don't apply to them (since e.g. descriptions of project's history and its ethical aims aren't less true for derived versions).
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