awscrt bundles the following third-party code. See src/VENDORED.md for the
exact upstream tags and commits.

aws-checksums (src/aws-checksums/)
  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  License: Apache-2.0 (src/aws-checksums/LICENSE)
  https://github.com/awslabs/aws-checksums

aws-c-common (src/aws-c-common/)
  Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
  License: Apache-2.0 (src/aws-c-common/LICENSE, src/aws-c-common/NOTICE)
  https://github.com/awslabs/aws-c-common
  Only the CPU feature detection sources and the headers reachable from the
  checksum code are included.

The R code and the .Call binding layer are licensed under Apache-2.0 as well.