What does Hive and Impala ODBC "C6 Compatible" mean?

[#1]

The following ODBC download page version has the description "C6 Compatible".
　https://www.cloudera.com/downloads/connectors/hive/odbc/2-6-1.html
　　Hive ODBC Connector 2.5.25 (C6 Compatible)
　https://www.cloudera.com/downloads/connectors/impala/odbc/2-6-2.html
　　Impala ODBC Connector 2.5.42 (C6 Compatible)

What does "C6 compatible" mean?

[#2]

"C6" is CDH version 6?

Each ODBC document (pdf) states that the driver supports 5.x.

Is 6.x also supported?
Or is it not supported but at a level that works for compatibility?

I refer below:

 * Hive ODBC doc

  * 2.5.25 : https://www.cloudera.com/documentation/other/connectors/hive-odbc/2-5-25/Cloudera-ODBC-Driver-for-Ap...

   * The Cloudera ODBC Driver for Apache Hive supports Apache Hive versions 0.11 through 2.1, and CDH versions 5.0 through 5.13. The driver also supports later minor versions of CDH 5.

 * Impala ODBC doc

  * 2.5.42 : https://www.cloudera.com/documentation/other/connectors/impala-odbc/2-5-42/Cloudera-ODBC-Driver-for-...

   * The Cloudera ODBC Driver for Impala is recommended for Impala versions 1.0.1 through 2.10, and CDH versions 5.0 through 5.13. The driver also supports later minor versions of CDH 5.

[#3 · Accepted solution]

From the following page, I was informed that "C6 Compatible" is gone.
 * https://www.cloudera.com/downloads/connectors/hive/odbc/2-6-1.html
 * https://www.cloudera.com/downloads/connectors/impala/odbc/2-6-2.html

In Japan time, there was a description in 4/11, but it was that it was deleted in 4/12.

Thank you for the correction.
Unaware "C6 Compatible", use the latest version of ODBC.