Update README.md

Author: Bernhard Grünewaldt

README.md

@@ -2,7 +2,7 @@
 
 <a href="https://codeclou.github.io/enterprise-integration-pattern-shapes-for-gliffy/"><img src="https://codeclou.github.io/enterprise-integration-pattern-shapes-for-gliffy/images/github-product-logo-eip-shapes-gliffy.png" width="100%"/></a>
 
-This project provides [SVG](http://de.wikipedia.org/wiki/Scalable_Vector_Graphics)-shapes for the [Enterprise Integration Patterns](http://www.eaipatterns.com/toc.html) that are intended to be used with [Gliffy](http://www.gliffy.com/).
+This project provides [SVG](https://de.wikipedia.org/wiki/Scalable_Vector_Graphics)-shapes for the [Enterprise Integration Patterns](https://www.enterpriseintegrationpatterns.com/toc.html) that are intended to be used with [Gliffy](https://www.gliffy.com).
 
 See the [project page](https://codeclou.github.io/enterprise-integration-pattern-shapes-for-gliffy/) for full documentation and **[usage guide](https://codeclou.github.io/enterprise-integration-pattern-shapes-for-gliffy/#usage-guide)**.
 
@@ -17,3 +17,7 @@ Here is a picture of some shapes so that you get an idea:
 ### License
 
 [CC-BY-SA-4.0 License](./LICENSE) © [codeclou](https://github.com/codeclou)
+
+### Trademarks
+
+[Gliffy](https://www.gliffy.com) is a trademark of [Perforce Software, Inc.](https://www.perforce.com/)