Right inside Aperture or Lightroom, select your image, edit and add a text layer. A style can be applied to the text (stroke/blend/opacity/shadow/ slant...).
The text remains live until flattened back to your host.
TEXT GALLERY
You are a photographer and want to lock a style and a watermark that you will apply on a catalog of pictures. Easy you can save and recall blocks of text and styles.
Just inside Apple Aperture, Adobe Lightroom, Photoshop or Elements. HSC Edit lets you prepare a text/watermark that you can save and recall instantly on another photo later on.