SIL Open Font License 1.1: what you can do with these fonts

Whatever you make with the font is yours; the licence covers the font files.

"The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives."

A logo is a document made with the font; the licence sets no limit on it.

"The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives."

Serving the file to browsers is redistribution: the copyright notice and licence travel with it, and the font file's own metadata counts.

"These can be included either as stand-alone text files, human-readable headers or in the appropriate machine-readable metadata fields within text or binary files as long as those fields can be easily viewed by the user."

Bundle it in free or paid software; ship the copyright notice and licence with it.

"Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold with any software, provided that each copy contains the above copyright notice and this license."

A modified font stays under the OFL and must not use a Reserved Font Name (each font page lists its own).

"No Modified Version of the Font Software may use the Reserved Font Name(s) unless explicit written permission is granted by the corresponding Copyright Holder."

Share it freely, with its copyright notice and the OFL.

"The Font Software, modified or unmodified, in part or in whole, must be distributed entirely under this license, and must not be distributed under any other license."

Selling it inside software you sell is allowed (condition 2); selling the font alone is not.

"Neither the Font Software nor any of its individual components, in Original or Modified Versions, may be sold by itself."

The notice goes with copies of the font file, not into what you make.

"The requirement for fonts to remain under this license does not apply to any document created using the fonts or their derivatives."