vendor/qpdf.js and vendor/qpdf.wasm.js

qpdf itself (https://github.com/qpdf/qpdf), version 12.2.0, is licensed under
the Apache License 2.0 - see LICENSE-qpdf.txt.

The WebAssembly build comes from the npm package @neslinesli93/qpdf-wasm 0.3.0
(https://github.com/neslinesli93/qpdf-wasm). Its package.json declares the ISC
licence; the repository has no separate LICENSE file. ISC licence text:

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

qpdf.wasm.js is the unmodified qpdf.wasm binary from that package, base64-encoded
so browsers can load it from a local file.