Remember when Google was cool and not evil and released their book scanner project for free? https://code.google.com/archive/p/linear-book-scanner/

  "Google hereby grants to you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, transfer, and otherwise run, modify and propagate this design..."