Why you shouldn't put the DGA logo in your end credits

The DGA Doesn't allow using its logo in credits in any manner.

The DGA logo is a registered trademark of the Directors Guild of America, Inc. and the Guild does not permit its usage in any manner in credits.

Source: the Credits page on the DGA website. (Click on "View: Screen Credits", then scroll to the bottom of the page.)

Remember to Respect Trademarks

We occasionally field requests for the DGA (Directors' Guild of America) logo. Since the DGA expressly disallows this, it's a good reminder to always exercise caution when using trademarked logos or other intellectual property in your credits.

While many parties will be happy for the additional exposure, you'll always want to make sure that you have express permission from the rightsholder.