Adidas promotes its 'own' shirt numbers, as far as I know, since 2000. Unlike Nike, Adidas doesn't introduce new numbers every two year. Untill now, May 2005, she sticks to the same typeface: Serpentine Medium Oblique. This is a commercial available typeface, and as far as I can judge the only thing that has been altered in the design is that the numbers are electronically condensed and stroke widths are slightly adjusted. From a standpoint of branding and protection against plagiarism this is a doubtful choice. In fact everyone can buy this typeface, condense it and use it to print names and numbers on a shirt without violating copyrights.
Figures from Serpentine Medium Oblique, squeezed to 60 percent.