TPTQ Arabic offers a special font licence that allows installation of fonts on web servers
Broadcast On Television Cable Or The Internet; Feature Movies, Film. Broadcast and Film Usage refers to the use of the Font Software in titling, credits for any on-screen broadcast via television, or motion picture titling.
TPTQ Arabic Webfont Service Licence Agreement, for server hosted web fonts using @font-face declaration.
After licensing a single font you can always upgrade it to a complete package, and you will never pay more than the total price of the complete package.
The difference between TPTQ Arabic's AR and AR+LT fonts is that AR fonts do not include Latin characters. AR+LT fonts support Western European Latin-based languages