Photographic behavior CAPTCHA assets, 2026-10-10 1. Real scenic photographs: 30 individually checked Wikimedia Commons files with image-file CC0 licensing (not merely CC0 metadata). Authors, file-page URLs, license, source bytes/hash, final bytes/hash and crop/resize changes are recorded in PHOTO-SOURCES.json. Originals are archived in the build research directory. Runtime uses local 800x400 JPEGs only. No AI-generated landscape, cartoon, placeholder scene, stock demo server or remote image URL. CC0-1.0 full text is included in CC0-LICENSE.txt. 2. Semantic silhouette masks: Font Awesome Free, Fonticons Inc. https://fontawesome.com/ and https://github.com/FortAwesome/Font-Awesome Commit 14c65a3747d0f3b751f15831fc719236aea8729d 30 SVGs: dragon, motorcycle, bicycle, person-skiing, person-swimming, person-snowboarding, person-skating, person-biking, person-hiking, person-running, cat, dog, horse, dove, frog, hippo, otter, fish, spider, anchor, car-side, truck-pickup, helicopter, jet-fighter, sailboat, shrimp, mosquito, locust, crow, hammer. SVG icons are CC BY 4.0, NOT MIT or OFL. Original embedded copyright comments retained in silhouette-source/. Modified by rasterization to masks, scaling, and runtime rotation, shading/cutting. Runtime imagery includes these adapted shapes. The verification image's help panel links to this attribution. License: https://creativecommons.org/licenses/by/4.0/ See Font-Awesome-LICENSE.txt. No brand logos or paid/pro icons are used. 3. Retained inactive R151 asset: HYBehaviorSC.otf, common-character Noto Sans SC Medium, under SIL Open Font License 1.1. Copyright 2014-2021 Adobe. https://github.com/notofonts/noto-cjk Source commit f8d157532fbfaeda587e826d4cd5b21a49186f7c Source Sans/SubsetOTF/SC/NotoSansSC-Medium.otf SHA256: 7633f5a016d4dd95e685a69633d818aabc4644c4b08e26bd35b1b30c45ed5dda Build recipe: prepare_photographic_assets.py. Modified font family, PostScript and CFF names are HY Behavior SC / HYBehaviorSC, not Noto. Source font remains available in asset-source/ in the full source delivery. All chosen common Chinese characters checked against cmap with none missing. See NotoSans-LICENSE. Font is NOT CC0, CC BY or Apache. 4. Retained inactive R151 assets: 30 geometric point-click icon PNGs are original artwork created for this project and dedicated under CC0-1.0. These are not loaded by R152. All non-arc CAPTCHA generators and operations are removed. The root GoCaptcha assets/resources license is not used as authorization for unclearly attributed demo fonts/photos. Those demo assets and Pic0-Pic4 are not read by this new runtime. No license of the existing application is changed. ASSET-MANIFEST.json lists material hashes. Asset catalogs do not contain challenge-specific answers, random seeds, challenge IDs, or credentials. Photograph attribution and source pages: A mountain trail.jpg — Mscai https://commons.wikimedia.org/wiki/File:A_mountain_trail.jpg CC0-1.0; cropped/resized. Alone in the unspoilt wilderness (Unsplash).jpg — David Marcu davidmarcu https://commons.wikimedia.org/wiki/File:Alone_in_the_unspoilt_wilderness_(Unsplash).jpg CC0-1.0; cropped/resized. Colorful mountain slope in Landmannalaugar.jpg — Syony https://commons.wikimedia.org/wiki/File:Colorful_mountain_slope_in_Landmannalaugar.jpg CC0-1.0; cropped/resized. Rocky Mountain Range at Estes Park.jpg — Aronb04 https://commons.wikimedia.org/wiki/File:Rocky_Mountain_Range_at_Estes_Park.jpg CC0-1.0; cropped/resized. Snow-capped mountain range.jpg — Mshuang2 https://commons.wikimedia.org/wiki/File:Snow-capped_mountain_range.jpg CC0-1.0; cropped/resized. Vermont Mountain Forest.jpg — Kurtkaiser https://commons.wikimedia.org/wiki/File:Vermont_Mountain_Forest.jpg CC0-1.0; cropped/resized. Mountain fog view.jpg — Darakshanehaluddin https://commons.wikimedia.org/wiki/File:Mountain_fog_view.jpg CC0-1.0; cropped/resized. A view of the Taunus mountain range during fog.png — Greg200906 https://commons.wikimedia.org/wiki/File:A_view_of_the_Taunus_mountain_range_during_fog.png CC0-1.0; cropped/resized. Lake Minnewanka, Canada.jpg — Vlunyak https://commons.wikimedia.org/wiki/File:Lake_Minnewanka,_Canada.jpg CC0-1.0; cropped/resized. Lake Sutherland.jpg — Natalie Fernandez https://commons.wikimedia.org/wiki/File:Lake_Sutherland.jpg CC0-1.0; cropped/resized. Lake Kaurapataka - 05.jpg — David Nind https://commons.wikimedia.org/wiki/File:Lake_Kaurapataka_-_05.jpg CC0-1.0; cropped/resized. First Badukskoe Lake water.jpg — Alexander Roumega https://commons.wikimedia.org/wiki/File:First_Badukskoe_Lake_water.jpg CC0-1.0; cropped/resized. Margaret Lake.jpg — Riddles42 https://commons.wikimedia.org/wiki/File:Margaret_Lake.jpg CC0-1.0; cropped/resized. Lankaran Khanbulan lake.png — By.faridd https://commons.wikimedia.org/wiki/File:Lankaran_Khanbulan_lake.png CC0-1.0; cropped/resized. A boat on the Emre Lake in Afyonkarahisar, wide-view.jpg — Raicem https://commons.wikimedia.org/wiki/File:A_boat_on_the_Emre_Lake_in_Afyonkarahisar,_wide-view.jpg CC0-1.0; cropped/resized. Caddo Lake kayaking.jpg — Luka Maglc https://commons.wikimedia.org/wiki/File:Caddo_Lake_kayaking.jpg CC0-1.0; cropped/resized. Lake of Doukonta.jpg — Phiphi34 https://commons.wikimedia.org/wiki/File:Lake_of_Doukonta.jpg CC0-1.0; cropped/resized. Venice Old Town Lagoon Aerial View.jpg — Horst-schlaemma https://commons.wikimedia.org/wiki/File:Venice_Old_Town_Lagoon_Aerial_View.jpg CC0-1.0; cropped/resized. View from Rialto Bridge, Venice.jpg — Gerda Arendt https://commons.wikimedia.org/wiki/File:View_from_Rialto_Bridge,_Venice.jpg CC0-1.0; cropped/resized. Rialto-Bridge-Venice-20050525-023.jpg — Gary Houston https://commons.wikimedia.org/wiki/File:Rialto-Bridge-Venice-20050525-023.jpg CC0-1.0; cropped/resized. Antelope Mountain Utah 2020.jpg — Jstuby https://commons.wikimedia.org/wiki/File:Antelope_Mountain_Utah_2020.jpg CC0-1.0; cropped/resized. Dusk at the Pinacle Mountain Lookout.jpg — Tyler C. https://commons.wikimedia.org/wiki/File:Dusk_at_the_Pinacle_Mountain_Lookout.jpg CC0-1.0; cropped/resized. Mountain Range (Tumblr).jpg — jay mantri https://commons.wikimedia.org/wiki/File:Mountain_Range_(Tumblr).jpg CC0-1.0; cropped/resized. Lake Ontario Shoreline.jpg — SAF1999 https://commons.wikimedia.org/wiki/File:Lake_Ontario_Shoreline.jpg CC0-1.0; cropped/resized. Bath House Cultural Center at White Rock Lake.jpg — DronePhotographer https://commons.wikimedia.org/wiki/File:Bath_House_Cultural_Center_at_White_Rock_Lake.jpg CC0-1.0; cropped/resized. Lake Balkhash. Mynaral village. 14.jpg — AALLMMAATT https://commons.wikimedia.org/wiki/File:Lake_Balkhash._Mynaral_village._14.jpg CC0-1.0; cropped/resized. Novopyatigorskoe Lake and Beshtau.jpg — Alexander Roumega https://commons.wikimedia.org/wiki/File:Novopyatigorskoe_Lake_and_Beshtau.jpg CC0-1.0; cropped/resized. Landscape South of Urbino, Taken from Parco della Resistenza at Late Sunset.jpg — Julian Lupyan https://commons.wikimedia.org/wiki/File:Landscape_South_of_Urbino,_Taken_from_Parco_della_Resistenza_at_Late_Sunset.jpg CC0-1.0; cropped/resized. Lemon Grey 2252546.jpg — ulleo from Pixabay https://commons.wikimedia.org/wiki/File:Lemon_Grey_2252546.jpg CC0-1.0; cropped/resized. Lemon Tart With Plate And Spoon.jpg — Oskordion https://commons.wikimedia.org/wiki/File:Lemon_Tart_With_Plate_And_Spoon.jpg CC0-1.0; cropped/resized.