/usr/share/purple/ca-certs/DigiCertHighAssuranceCA-3.pem is in libpurple0 1:2.10.9-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | -----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
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