This is how they want you to use it:
> Trademarks are proper adjectives and should be followed by the generic terms they describe.
> Correct: The image was manipulated using Adobe® Photoshop® software.
> Incorrect: The image was manipulated using Photoshop.
Adobe's own marketing pages consistently use the ostensibly "incorrect" usage though: http://www.adobe.com/au/products/photoshop.html