DCC copyright and licensing notice
==================================

Copyright (C) 2026 WEIAN DATA TECH (Beijing) Co., Ltd.
(惟安数据科技（北京）有限公司)
Contact: contact@weiandata.com

DCC source code, documentation, tests, and bundled synthetic data are
copyrighted by WEIAN DATA TECH (Beijing) Co., Ltd. and distributed under the
GNU General Public License version 2 or, at the recipient's option, any later
version (GPL >= 2).

External runtime dependencies
-----------------------------

The following packages are separately distributed; their source is not bundled
in DCC and their copyright remains with their respective holders.
Dependencies retain their upstream ownership and license terms.

Package: data.table
Use: Core tabular data processing
Upstream project: https://CRAN.R-project.org/package=data.table
License: MPL-2.0 | file LICENSE

Package: stringi
Use: Encoding detection and Unicode string processing
Upstream project: https://CRAN.R-project.org/package=stringi
License: file LICENSE

Optional format, reporting, and test features use readxl (MIT), writexl
(BSD-2-Clause), haven (MIT), arrow (Apache License 2.0 or later), jsonlite
(MIT), yaml (BSD-3-Clause), knitr (GPL), rmarkdown (GPL-3), and testthat (MIT),
as recorded in their upstream package metadata. Their source is not bundled.

These references do not imply endorsement, ownership transfer, or a change to
upstream license terms.

License
-------

The complete DCC package is distributed under the GNU General Public License
version 2 or, at the recipient's option, any later version (GPL >= 2).
Copyright in external dependencies remains with their respective holders.