With these guide books downloads in PDF, are users free to use PDF annotation software such as PDF View & Edit software or Xodo PDF & Annotation software or Adobe PDF to highlight & draw a circle around certain important sections such as "Split Screen: & “Chart formatting”, Note or Warning sections in your PDF books?? This would be a good FAQS ? on PDF book downloads. Please let me know if PDF annotation feature in PDF Readers is allowed for use with your Document Foundation Libre Office PDF Guide downloads after downloading & opening guide in PDF software on home pcs… Thanks
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Each such guide includes a copyright+license information; it’s GPLv3 and CC BY 4.0 for Calc Guide 6.2 (didn’t check other guides, though expect them to be the same/similar). Those are naturally free licenses (in the spirit of the project) allowing you to modify it as you like. But by all means, consult a lawyer in case of any doubt.
Thank you!! I apologize for this ? of mine being off-topic & irrelevant.