[How to upgrade]
  The installation/upgrading procedure is described on the release note which is included in the zipped download file in this page.

[Specifications changed in Ver. 1.21]
- The description of the company name in Web UI is changed.

[Issues fixed in Ver. 1.21]
- Fixed an issue where setting values would be changed to default or other values in rare cases.
- Fixed an issue where URL containing symbolic characters could not be specified over URL for RTMP.