US Patent and Trademark Office. Has searchable database of registered trademarks and service marks, updated trademark and patent laws, application forms, schedule of fees for registering trademarks.
Amazon.com carries Randall Wixen's The Plain and Simple Guide to Music Publishing
. This is the only book you will ever need to learn how to publish your own music and to legally and simply license the music of others.
Creative Commons. Facilitators of a copyright alternative, with many supporters, especially among the scientific and internet programming community.
Gnu.org carries writings of Richard Stallman on "copy left" — recommending sharing and free use of software.