tillitis-key/LICENSES/README.md

Tillitis TKey Licensing

Main license

Unless otherwise noted, the project sources are copyright Tillitis AB, but you can redistribute it and/or modify it under the terms of the BSD-2-Clause license. See BSD-2-Clause.txt.

Until Oct 29, 2025, the license was GPL-2.0 Only.

This directory contains copies of the license texts used by the sources included in the project source tree.

SPDX

The project uses single-line references to Unique License Identifiers as defined by the Linux Foundation's SPDX project. The line in each individual source file identifies the license applicable to that file.

The current set of valid, predefined SPDX identifiers can be found on the SPDX License List at:

https://spdx.org/licenses/

Notable imported projects

• ch552 firmware: hw/usb_interface/ch552_fw/

  Originally by WCH under MIT. Much changed by Tillitis.

• picorv32: hw/application_fpga/core/picorv32

  From https://github.com/YosysHQ/picorv32

  ISC.

• PicoRV32 custom ops: hw/application_fpga/fw/tk1/picorv32/

  CC-1.

• tkey-libs: hw/application_fpga/tkey-libs/

  BSD2. From https://github.com/tillitis/tkey-libs