CMSIS-SVD files, for convenience. All of these files are provided by MCU/CPU vendors, although some of them have been corrected, in case of obvious mistakes in the original files, whose solution was obvious too.
The reason why this repository exists at all is that there is no official public repository that contains these files.
The license that applies to files in this repository is the original vendor license, which typically is unclear. Some README files are provided, with links to the original source for the files. Users of this repository are responsible for checking that they do not breach any license when using the files.