Transfer instead of transferral may be an even simpler choice for Überlassung which I prefer. Depending on how legalese this should sound you may want to use "relinquishment", but judge by your context.

Cheerio,
Dierk

P.S. Check the Proz.com glossary for good hints, see URL #2 below.

I fully appreciate your frustration. This is always a bit of a headache to translate.

..."contract/agreement for the transfer of use regarding software C ...."

You could also say:

"... contract for the granting of rights to use software C ...."

or:

" ... contract for granting a license to use software ...."

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Thanks and Cheerio,
Dierk