class RubyDocInfo
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If rubygems.org/gems/foo don't provide a source_code link, and you don't want download a gem by link as rubygems.org/downloads/foo-0.0.2.gem and scan its source code, then you can get [YARD](yardoc.org) Ruby documents by this website service.
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For safe, download gem package and scan file `license*` is the best way.