Caputchin

Third-party notices

Caputchin uses open-source software and assets from third parties. This page carries the attribution and license text their terms require. It sits alongside the per-package notices that ship inside the @caputchin/widget package and each marketplace game's own repository.

Cap proof-of-work (bundled in the widget, Apache-2.0)

The Caputchin widget runs a proof-of-work challenge in the visitor's browser using Cap (source). The @caputchin/widget bundle embeds Cap's browser widget (@cap.js/widget) and its proof-of-work solver WebAssembly (@cap.js/wasm) in full, and uses Cap for the proof-of-work challenge and the related instrumentation.

Copyright 2025 Tiago

Licensed under the Apache License, Version 2.0 (the "License"); you may not use these files except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

pako (bundled in the widget, MIT)

The @caputchin/widget bundle also embeds the inflate build of pako, used as a decompression fallback on browsers without the native DecompressionStream API.

Copyright (C) 2014-2017 by Vitaly Puzrin and Andrei Tuputcyn

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Phobos game engine (DOOM engine, GPL-2.0-only)

The Phobos game runs a real DOOM engine, compiled from a patched copy of doomgeneric (itself derived from Chocolate Doom and the original DOOM source that id Software released under the GPL in 1999). Because the Phobos game links that engine, the game as a whole is distributed under the GNU General Public License, version 2 (GPL-2.0-only).

  • Copyright (C) 1993-1996 id Software, Inc.
  • Copyright (C) 2005-2014 Simon Howard and the Chocolate Doom contributors.
  • Copyright (C) the doomgeneric contributors.

The complete corresponding source for the engine as shipped, including the Phobos patches, is available in the Phobos game's source repository (its engine/ directory), offered under the same GPL-2.0 terms. The full text of GPL version 2 is available at gnu.org.

The live bundle also embeds fflate (MIT), used only to gunzip the engine on browsers without the native DecompressionStream API.

Freedoom game data and face artwork (BSD-3-Clause)

The Phobos game in our catalog, and the marine face used as the Phobos widget's brand mark, are built from assets of the Freedoom project, a free and libre replacement for the DOOM game data. No id Software game data, artwork, or branding is used.

Copyright (C) 2001-2024 Contributors to the Freedoom project. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  • Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
  • Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
  • Neither the name of the Freedoom project nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The Phobos face artwork used as a widget brand mark is part of this Freedoom data, under the BSD-3-Clause license above. It is not part of the GPL-licensed engine described above.

DOOM is a registered trademark of id Software LLC, a ZeniMax Media company. Caputchin and Phobos are not affiliated with, endorsed by, or sponsored by id Software. Any reference to "DOOM" describes the engine lineage and implies no affiliation.