Warning:
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If you remove a person’s access to a private repository, any of their forks of that private repository are deleted. Local clones of the private repository are retained. If a team's access to a private repository is revoked or a team with access to a private repository is deleted, and team members do not have access to the repository through another team, private forks of the repository will be deleted.
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When LDAP Sync is enabled, if you remove a person from a repository, they will lose access but their forks will not be deleted. If the person is added to a team with access to the original organization repository within three months, their access to the forks will be automatically restored on the next sync.
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You are responsible for ensuring that people who have lost access to a repository delete any confidential information or intellectual property.
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People with admin permissions to a private or internal repository can disallow forking of that repository, and organization owners can disallow forking of any private or internal repository in an organization. For more information, see "Managing the forking policy for your organization" and "Managing the forking policy for your repository."
Deleting a private repository
When you delete a private repository, all of its private forks are also deleted.
Deleting a public repository
When you delete a public repository, one of the existing public forks is chosen to be the new upstream repository. All other repositories are forked off of this new upstream and subsequent pull requests go to this new upstream repository.
Private forks and permissions
Private forks inherit the permissions structure of the upstream or parent repository. This helps owners of private repositories maintain control over their code. For example, if the upstream repository is private and gives read/write access to a team, then the same team will have read/write access to any forks of the private upstream repository. Only team permissions (not individual permissions) are inherited by private forks.
Changing a public repository to a private repository
If a public repository is made private, its public forks are split off into a new network. As with deleting a public repository, one of the existing public forks is chosen to be the new upstream repository and all other repositories are forked off of this new upstream. Subsequent pull requests go to this new upstream repository.
In other words, a public repository's forks will remain public in their own separate repository network even after the upstream repository is made private. This allows the fork owners to continue to work and collaborate without interruption. If public forks were not moved into a separate network in this way, the owners of those forks would need to get the appropriate access permissions to pull changes from and submit pull requests to the (now private) upstream repository—even though they didn't need those permissions before.
If a public repository has anonymous Git read access enabled and the repository is made private, all of the repository's forks will lose anonymous Git read access and return to the default disabled setting. If a forked repository is made public, repository administrators can re-enable anonymous Git read access. For more information, see "Enabling anonymous Git read access for a repository."
Deleting the private repository
If a public repository is made private and then deleted, its public forks will continue to exist in a separate network.
Changing a private repository to a public repository
If a private repository is made public, each of its private forks is turned into a standalone private repository and becomes the upstream of its own new repository network. Private forks are never automatically made public because they could contain sensitive commits that shouldn't be exposed publicly.
Deleting the public repository
If a private repository is made public and then deleted, its private forks will continue to exist as standalone private repositories in separate networks.
Changing the visibility of an internal repository
If the policy for your enterprise permits forking, any fork of an internal repository will be private. If you change the visibility of an internal repository, any fork owned by an organization or personal account will remain private.
Deleting the internal repository
If you change the visibility of an internal repository and then delete the repository, the forks will continue to exist in a separate network.