README.txt

3rd party libraries provided by Drupal core should be placed in this directory.
They should not be modified from their original form at any time. They should
be changed only to keep up to date with upstream projects.

Code in this directory MAY be licensed under a GPL-compatible non-GPL license.
If so, it must be properly documented in COPYRIGHT.txt.

File

drupal/core/vendor/README.txt
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  1. 3rd party libraries provided by Drupal core should be placed in this directory.
  2. They should not be modified from their original form at any time. They should
  3. be changed only to keep up to date with upstream projects.
  4. Code in this directory MAY be licensed under a GPL-compatible non-GPL license.
  5. If so, it must be properly documented in COPYRIGHT.txt.