The use of another logo without the owner’s permission is likely to raise the type of confusion that creates trademark infringement, since a graphical logo arguably creates a stronger impression of affiliation than mere text. Hence you have to be very careful when using another logo in your own for branding. You need to make sure the logo is in public domain and not trademarked to be able to use it freely, for example the recycle symbol or the dollar symbol.
While using the font for your logotype, to use any part of a scalable typeface in a logo design, you should first read the user agreement and check with the type foundry that designs and/or distributes the typefaces to confirm whether you may use the typeface in the logo design. Fonts should be purchased separately per user otherwise it violates the end-user license agreement between the logo designer and the typeface designer. This does not mean you cannot legally ‘copy’ another font as certain SIL laws permit you to do so. Also, under the pretext of ‘fair usage’ it is possible to use another logo for your purpose. Basically you have to have thorough permissions from the owner of the logo for usage of the same to avoid copyright/trademark infringement hassles.

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