Licensing do's and don'ts

There more than 55 open-source licenses listed as "approved" by the Open Source Initiative. All include provisions that the source code is used "as is" and, just like proprietary software, the licenses offer no warranties; plus, they all require you to include the copyright or patent notice of the source code owner. Here are some other provisions:

Apache License 2.0: You must include a prominent notice of all changes that have been made to source code.

BSD: You may distribute modified or combined open-source code with or without including your source code.

GPL: If you modify open-source code or combine it with your own, your code must be made open when you distribute the new code.