Like this font can I use it in other design? or use to be Movie subtitles?
The web-only fonts on Typekit, such as Liberation Serif, can't be used for anything other than a website. To create subtitles for a movie, you will need a font that is licensed for sync on Typekit. There is more information on the font licensing page:
and here are some similar options that may work for your project:
You can also look into whether the foundry offers a desktop license for the font(s) outside of Typekit. Liberation Serif is from Red Hat:
I hope that this helps; let me know if you have any other questions! Best,