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Set the persistence value on the Keyring. Value may be
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string representing one of those constants. For example,
'local machine' or 'session'.
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Attempt to decode the credential blob as UTF-16 then UTF-8.
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WinVaultKeyring stores encrypted passwords using the Windows Credential
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This backend does some gymnastics to simulate multi-user support,
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https://github.com/jaraco/keyring/issues/47#issuecomment-75763152
for details on the implementation, but here's the gist:
Passwords are stored under the service name unless there is a collision
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