There was a recent flurry of emails when a Citrix partner wanted to know whether they could redistribute our SDK libraries as a part of the integration with their tool. Brad Pedersen (Chief Architect and Senior Fellow) confirmed that we allow distribution of Citrix libraries with products modified using the SDKs. In fact, we encourage our customers and partners to embed, integrate, and distribute our libraries. This way, we grow the Citrix ecosystem and the community.

I have also posted the revised EULA on the Citrix Developer Network so you don’t have to download and install the SDK to read it. The EULA clarifies the above distribution rights.
http://community.citrix.com/display/cdn/Citrix+End+User+License+Agreement