No. The API deliberately has no such method. The only official way is go.licenseKey .
This post covers the official, legal method for removing the watermark and addresses why your license key might not be working as expected. 1. The Official Method: Purchasing a License gojs remove watermark
For GoJS version 1.7 and later, you must use a license key provided after purchasing the software. Google Groups Apply the key: This post covers the official, legal method for
: License keys are tied to major and minor version numbers (e.g., 2.1 vs 2.2). If you upgrade your library version, you may need to request a new key from Product Activation Implementation Error : Verify that go.Diagram.licenseKey is assigned the diagram is initialized. Serving Source Google Groups Apply the key: : License keys
// The ONLY official way to remove the GoJS watermark go.GraphObject.licenseKey = "YOUR_PURCHASED_LICENSE_KEY_HERE";
If you attempt to remove the watermark without a valid license: