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40 lines
2.5 KiB
Markdown
40 lines
2.5 KiB
Markdown
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# system.licenses {#system-tables_system.licenses}
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Сontains licenses of third-party libraries that are located in the [contrib](https://github.com/ClickHouse/ClickHouse/tree/master/contrib) directory of ClickHouse sources.
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Columns:
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- `library_name` ([String](../../sql-reference/data-types/string.md)) — Name of the library, which is license connected with.
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- `license_type` ([String](../../sql-reference/data-types/string.md)) — License type — e.g. Apache, MIT.
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- `license_path` ([String](../../sql-reference/data-types/string.md)) — Path to the file with the license text.
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- `license_text` ([String](../../sql-reference/data-types/string.md)) — License text.
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**Example**
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``` sql
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SELECT library_name, license_type, license_path FROM system.licenses LIMIT 15
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```
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``` text
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┌─library_name───────┬─license_type─┬─license_path────────────────────────┐
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│ FastMemcpy │ MIT │ /contrib/FastMemcpy/LICENSE │
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│ arrow │ Apache │ /contrib/arrow/LICENSE.txt │
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│ avro │ Apache │ /contrib/avro/LICENSE.txt │
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│ aws-c-common │ Apache │ /contrib/aws-c-common/LICENSE │
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│ aws-c-event-stream │ Apache │ /contrib/aws-c-event-stream/LICENSE │
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│ aws-checksums │ Apache │ /contrib/aws-checksums/LICENSE │
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│ aws │ Apache │ /contrib/aws/LICENSE.txt │
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│ base64 │ BSD 2-clause │ /contrib/base64/LICENSE │
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│ boost │ Boost │ /contrib/boost/LICENSE_1_0.txt │
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│ brotli │ MIT │ /contrib/brotli/LICENSE │
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│ capnproto │ MIT │ /contrib/capnproto/LICENSE │
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│ cassandra │ Apache │ /contrib/cassandra/LICENSE.txt │
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│ cctz │ Apache │ /contrib/cctz/LICENSE.txt │
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│ cityhash102 │ MIT │ /contrib/cityhash102/COPYING │
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│ cppkafka │ BSD 2-clause │ /contrib/cppkafka/LICENSE │
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└────────────────────┴──────────────┴─────────────────────────────────────┘
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```
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[Original article](https://clickhouse.tech/docs/en/operations/system_tables/licenses) <!--hide-->
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