Feel free to upload any example code to the Derby Wiki that you yourself have developed and have the right to license under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0.txt). The http://www.apache.org/legal/src-headers.html page has information you should review first, and it includes the license you should include in the header of your source file:
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
Some other licenses, such as BSD, are compatible with the Apache License and are fine to use (see "Category A: Authorized Licenses" in the proposal at http://people.apache.org/~cliffs/3party.html). Code not available under an authorized license should be hosted elsewhere, but feel free to link to it from this Wiki.