Although you can manually customize the logo in each publishing style such as the Player, the Presentation, and the document formats, you can also globally change the logo in all publishing styles and languages for a specific category in the Library.
You should always make a copy of original publishing styles installed with the software before you make any modifications. Also consider adding a new category in which to store the customized publishing styles. When you publish content, make sure you choose the appropriate category that contains the customized publishing styles.
Note: If you create custom publishing styles, you should document your customizations so you can easily re-apply them, if necessary, after a software upgrade.