The "Ridibatang" font is available for free to all users, including individuals and businesses, and you are free to modify and redistribute it.
However, selling the font itself is prohibited. The "Ridibatang" font can be bundled, redistributed, or sold with other software, including this copyright notice and license text.
If it is difficult to include the full license text, we recommend acknowledging the source of the "Ridibatang" font. For example, "This page uses the "Ridibatang" font provided by Ridibooks Inc."
This Font Software is licensed under the SIL Open Font License, Version 1.1.
Ridibooks Inc. owns the copyright to "Ridibatang."